wmaker: add directional window focus

This patch is adding directional window focus
(like in openbox), where the focus can be passed to
the current window neighboors with a shortcut key.
Comparisons are performed using window centres.

New options are FocusWindowLeftKey, FocusWindowRightKey,
FocusWindowUpKey, FocusWindowDownKey.
Other WM are setting those to SUPER+LEFT/RIGHT/UP/DOWN keys
but currently those are not set by default.

CirculateRaise option which is described in WPrefs as
'Raise window when switching focus with keyboard' is also
used to raise/not raise windows that are fully covered by
other windows.

NEWS

@@ -1,10 +1,183 @@
 NEWS for veteran Window Maker users
 -----------------------------------
 
+-- 0.97.0
+
+Directional window focus
+------------------------
+
+The keyboard focus can now be moved in a specific direction (left, right,
+up, down) relative to the currently focused window, using window centres
+for comparison. The shortcuts can be configured in WPrefs under
+"Keyboard Shortcuts", or set directly in ~/GNUstep/Defaults/WindowMaker
+via "FocusWindowLeftKey", "FocusWindowRightKey", "FocusWindowUpKey" and
+"FocusWindowDownKey" (disabled by default).
+
+The existing "CirculateRaise" option ("Raise window when switching focus
+with keyboard" in WPrefs) also controls whether windows that are fully
+obscured by others are raised when receiving focus this way.
+
+
+Vim-like window marking
+-----------------------
+
+Windows can now be dynamically assigned a mark label (a key or
+modifier+key combination) allowing them to be instantly recalled without
+searching. This is inspired by vim's mark-and-jump navigation.
+
+The mark label is displayed in the window list menu between the window
+title and the workspace name.
+
+Five actions can be configured in ~/GNUstep/Defaults/WindowMaker
+(or in WPrefs under "Keyboard Shortcuts")
+
+   "MarkSetKey": assign a label to the focused window (e.g. with the
+   action bound to "Super+M", pressing "Super+M x" marks the focused
+   window with label 'x').
+
+   "MarkUnsetKey": remove the mark from a labeled window.
+
+   "MarkJumpKey": focus and raise the window with the given label.
+
+   "MarkBringKey": move the marked window to the current workspace and
+   focus it.
+
+   "MarkSwapKey": swap the focused window with the marked window.
+
+Those are disabled by default.
+Marks are persistent across sessions and saved in the WMState file.
+
+
+Multi-key and sticky-chain keybindings
+--------------------------------------
+
+Keyboard shortcuts now support multi-key sequences, similar to
+Emacs-style prefix bindings (e.g. pressing a leader key followed by
+one or more continuation keys).
+
+An optional sticky-chain mode allows a prefix key to remain active
+until a cancel key is pressed or a timeout expires, making it possible
+to trigger multiple actions in sequence without re-entering the prefix.
+New options in ~/GNUstep/Defaults/WindowMaker:
+
+   "KeychainTimeoutDelay" is the timeout in milliseconds after which an
+   active chain expires. Default is 500. Set to 0 to disable the
+   timeout.
+
+   "KeychainCancelKey" sets a key to explicitly cancel an active chain.
+   (disabled by default).
+
+
+Configurable modifier key labels
+---------------------------------
+
+A new "ModifierKeyShortLabels" option in ~/GNUstep/Defaults/WindowMaker
+allows customizing the labels shown for modifier keys in menus and
+keyboard shortcut displays. Unicode symbols can be used in place of the
+default text labels. For example to use the same symbol as defined on
+MacOS:
+
+ModifierKeyShortLabels = (
+  "\342\207\247",
+  "\342\214\203",
+  "\342\214\245",
+  "\342\207\255",
+  "\342\207\263",
+  "\342\214\230",
+  "\342\207\252",
+  "\342\227\206",
+  "\342\214\245"
+);
+
+Configurable mouse wheel focus behavior
+----------------------------------------
+
+Scrolling the mouse wheel over a window can now optionally move the
+keyboard focus to that window. The option is available in WPrefs under
+"Expert User Preferences", or by setting "MouseWheelFocusEnable" in
+~/GNUstep/Defaults/WindowMaker (NO by default).
+
+
+Application icons in the window list
+-------------------------------------
+
+Application icons can now be shown in the window list menu. This behavior
+can be configured by setting the "WindowListAppIcons" option in
+~/GNUstep/Defaults/WindowMaker or "Show app icons in window list." in
+WPrefs under "Expert User Preferences" (NO by default).
+
+
+Configurable screenshot filename template
+-----------------------------------------
+
+The filename (strftime compatible) format used when saving screenshots
+can now be customized by setting the "ScreenshotFileNameTemplate"
+option in ~/GNUstep/Defaults/WindowMaker. The default remains the
+format introduced in 0.96.0.
+
+
+JPEG XL image support
+---------------------
+
+WRaster can now optionally load JPEG XL images if the libjxl
+library is present at build time. The feature can be toggled at
+configure time with --enable-jxl/--disable-jxl.
+
+
+wmiv: archive files and unknown format handling
+-----------------------------------------------
+
+wmiv can now open images stored inside archive files (with libarchive).
+A new option to silently skip unknown image formats is also available.
+It supports ctrl+c shortcut to copy the current image to the clipboard.
+
+
+Support for _NET_WM_MOVERESIZE
+------------------------------
+
+Window Maker now handles the _NET_WM_MOVERESIZE EWMH message, which
+allows applications to initiate interactive window moves and resizes
+through a standard protocol request (for those applications without
+decorations: VS Code, Google Chrome, Steam and Discord, ...).
+
+
+Cycle windows across all workspaces
+-----------------------------------
+
+A new 'Cycle all windows from all workspaces' expert option allows
+the Alt-Tab window switcher to include windows from all workspaces,
+not only the current one. Which is the "CycleAllWorkspaces" option
+in ~/GNUstep/Defaults/WindowMaker (NO by default).
+
+
+RandR and multi-monitor improvements
+------------------------------------
+
+RandR version >= 1.3 is automatically enabled when detected. By default,
+it operates in static mode, requiring the screen layout to be defined
+manually. A new "HotplugMonitor" option in ~/GNUstep/Defaults/WindowMaker
+(NO by default) enables automatic monitor detection on hotplug events,
+adding newly connected monitors to the right of the existing layout.
+This option is also available in WPrefs expert panel under
+"Automatically (de)activate monitors on hotplug events".
+
+
+Titlebar language button revamp
+-------------------------------
+
+When the modelock feature is enabled, the legacy hardcoded language
+dropdown icons in the titlebar are replaced by a compact button
+displaying the short name of the current XKB locale (those are
+basically the layouts displayed via setxkbmap -query).
+Clicking the button cycles through up to four keyboard layouts
+(matching the four XKB groups). The xkbfile library is required for
+this feature.
+
+
 -- 0.96.0
 
 Hot Corners feature
---------------------------
+-------------------
 
 Screen corners can be assigned an external command to be
 executed when the mouse pointer is entering those areas.

WPrefs.app/KeyboardShortcuts.c

@@ -103,9 +103,21 @@ static struct keyOption {
 	{ "SelectKey",      N_("Select active window") },
 	{ "FocusNextKey",   N_("Focus next window") },
 	{ "FocusPrevKey",   N_("Focus previous window") },
+	/* Directional window focus */
+	{ "FocusWindowLeftKey",  N_("Focus the window to the left") },
+	{ "FocusWindowRightKey", N_("Focus the window to the right") },
+	{ "FocusWindowUpKey",    N_("Focus the window above") },
+	{ "FocusWindowDownKey",  N_("Focus the window below") },
 	{ "GroupNextKey",   N_("Focus next group window") },
 	{ "GroupPrevKey",   N_("Focus previous group window") },
 
+	/* Vim-like Window Marking */
+	{ "MarkSetKey",   N_("Mark window: set mark") },
+	{ "MarkUnsetKey", N_("Mark window: unset mark") },
+	{ "MarkBringKey", N_("Mark window: bring marked window here") },
+	{ "MarkJumpKey",  N_("Mark window: jump to marked window") },
+	{ "MarkSwapKey",  N_("Mark window: swap with marked window") },
+
 	/* Workspace Related */
 	{ "WorkspaceMapKey",  N_("Open workspace pager") },
 	{ "NextWorkspaceKey", N_("Switch to next workspace") },

src/WindowMaker.h

@@ -609,6 +609,7 @@ extern struct wmaker_global_variables {
 
 			Atom icon_size;
 			Atom icon_tile;
+			Atom mark_key;
 		} wmaker;
 
 	} atom;

src/actions.c

@@ -240,6 +240,100 @@ void wSetFocusTo(WScreen *scr, WWindow *wwin)
 	old_scr = scr;
 }
 
+/*
+ *----------------------------------------------------------------------
+ * wSetFocusToDirection--
+ *	Moves focus to the nearest window in the given cardinal
+ *	direction (DIRECTION_LEFT, DIRECTION_RIGHT, DIRECTION_UP,
+ *	DIRECTION_DOWN from xinerama.h).
+ *
+ *	Selection algorithm: candidate windows are scored by
+ *	(primary_distance + perpendicular_offset). A large penalty is
+ *	added when the perpendicular offset exceeds the primary distance
+ *	(i.e. the candidate is more than 45 degrees off-axis). The window
+ *	with the lowest score wins. If no candidate exists in the requested
+ *	direction the call is silently ignored.
+ *----------------------------------------------------------------------
+ */
+void wSetFocusToDirection(WScreen *scr, int direction)
+{
+	WWindow *focused = scr->focused_window;
+	WWindow *best = NULL;
+	WWindow *candidate = NULL;
+	int my_cx, my_cy;
+	long best_score = -1;
+
+	if (!focused || !focused->flags.mapped)
+		return;
+
+	/* centre of the focused window */
+	my_cx = focused->frame_x + (int)focused->frame->core->width  / 2;
+	my_cy = focused->frame_y + (int)focused->frame->core->height / 2;
+
+	/* Iterate from most-recently-focused to least-recently-focused */
+	for (candidate = focused->prev; candidate != NULL; candidate = candidate->prev) {
+		int his_cx, his_cy, distance, offset;
+		long score;
+
+		if (!candidate->flags.mapped)
+			continue;
+		if (WFLAGP(candidate, no_focusable))
+			continue;
+		if (!candidate->frame || candidate->frame->workspace != scr->current_workspace)
+			continue;
+
+		/* ignore fully covered windows if cannot raised them */
+		if (!wPreferences.circ_raise && wWindowIsFullyCovered(candidate))
+			continue;
+
+		/* relative centre of candidate */
+		his_cx = (candidate->frame_x - my_cx) + (int)candidate->frame->core->width  / 2;
+		his_cy = (candidate->frame_y - my_cy) + (int)candidate->frame->core->height / 2;
+
+		switch (direction) {
+		case DIRECTION_RIGHT:
+			distance = his_cx;
+			offset = his_cy < 0 ? -his_cy : his_cy;
+			break;
+		case DIRECTION_LEFT:
+			distance = -his_cx;
+			offset = his_cy < 0 ? -his_cy : his_cy;
+			break;
+		case DIRECTION_DOWN:
+			distance = his_cy;
+			offset = his_cx < 0 ? -his_cx : his_cx;
+			break;
+		case DIRECTION_UP:
+			distance = -his_cy;
+			offset = his_cx < 0 ? -his_cx : his_cx;
+			break;
+		default:
+			continue;
+		}
+
+		/* candidate must be strictly in the requested direction */
+		if (distance <= 0)
+			continue;
+
+		score = distance + offset;
+
+		/* heavy penalty for windows more than 45 degrees off-axis */
+		if (offset > distance)
+			score += 1000000L;
+
+		if (best_score < 0 || score < best_score) {
+			best = candidate;
+			best_score = score;
+		}
+	}
+
+	if (best) {
+		if (wPreferences.circ_raise)
+			wRaiseFrame(best->frame->core);
+		wSetFocusTo(scr, best);
+	}
+}
+
 void wShadeWindow(WWindow *wwin)
 {
 

src/actions.h

@@ -41,6 +41,7 @@
 #define SAVE_GEOMETRY_ALL      SAVE_GEOMETRY_X | SAVE_GEOMETRY_Y | SAVE_GEOMETRY_WIDTH | SAVE_GEOMETRY_HEIGHT
 
 void wSetFocusTo(WScreen *scr, WWindow *wwin);
+void wSetFocusToDirection(WScreen *scr, int direction);
 
 int wMouseMoveWindow(WWindow *wwin, XEvent *ev);
 int wKeyboardMoveResizeWindow(WWindow *wwin);

src/defaults.c

@@ -721,6 +721,15 @@ WDefaultEntry optionList[] = {
 	    NULL, getKeybind, setKeyGrab, NULL, NULL},
 	{"FocusPrevKey", "Mod1+Shift+Tab", (void *)WKBD_FOCUSPREV,
 	    NULL, getKeybind, setKeyGrab, NULL, NULL},
+	/* Directional window focus */
+	{"FocusWindowLeftKey", "None", (void *)WKBD_FOCUSLEFT,
+	    NULL, getKeybind, setKeyGrab, NULL, NULL},
+	{"FocusWindowRightKey", "None", (void *)WKBD_FOCUSRIGHT,
+	    NULL, getKeybind, setKeyGrab, NULL, NULL},
+	{"FocusWindowUpKey", "None", (void *)WKBD_FOCUSUP,
+	    NULL, getKeybind, setKeyGrab, NULL, NULL},
+	{"FocusWindowDownKey", "None", (void *)WKBD_FOCUSDOWN,
+	    NULL, getKeybind, setKeyGrab, NULL, NULL},
 	{"GroupNextKey", "None", (void *)WKBD_GROUPNEXT,
 	    NULL, getKeybind, setKeyGrab, NULL, NULL},
 	{"GroupPrevKey", "None", (void *)WKBD_GROUPPREV,
@@ -823,6 +832,17 @@ WDefaultEntry optionList[] = {
 	    NULL, getKeybind, setKeyGrab, NULL, NULL},
 	{"PartialCaptureKey", "None", (void *)WKBD_PRINTP,
 	    NULL, getKeybind, setKeyGrab, NULL, NULL},
+	/* Vim-like Window Marking */
+	{"MarkSetKey", "None", (void *)WKBD_MARK_SET,
+		NULL, getKeybind, setKeyGrab, NULL, NULL},
+	{"MarkUnsetKey", "None", (void *)WKBD_MARK_UNSET,
+		NULL, getKeybind, setKeyGrab, NULL, NULL},
+	{"MarkBringKey", "None", (void *)WKBD_MARK_BRING,
+		NULL, getKeybind, setKeyGrab, NULL, NULL},
+	{"MarkJumpKey", "None", (void *)WKBD_MARK_JUMP,
+		NULL, getKeybind, setKeyGrab, NULL, NULL},
+	{"MarkSwapKey", "None", (void *)WKBD_MARK_SWAP,
+		NULL, getKeybind, setKeyGrab, NULL, NULL},
 
 #ifdef KEEP_XKB_LOCK_STATUS
 	{"ToggleKbdModeKey", "None", (void *)WKBD_TOGGLE,

src/event.c

@@ -1471,6 +1471,12 @@ static void wCancelChainTimer(void)
 #define ISMAPPED(w) ((w) && !(w)->flags.miniaturized && ((w)->flags.mapped || (w)->flags.shaded))
 #define ISFOCUSED(w) ((w) && (w)->flags.focused)
 
+static void startMarkCapture(WScreen *scr, Display *dpy, WMarkCaptureMode mode)
+{
+	scr->flags.mark_capture_mode = mode;
+	XGrabKeyboard(dpy, scr->root_win, False, GrabModeAsync, GrabModeAsync, CurrentTime);
+}
+
 static void dispatchWKBDCommand(int command, WScreen *scr, WWindow *wwin, XEvent *event)
 {
 	short widx;
@@ -1726,6 +1732,22 @@ static void dispatchWKBDCommand(int command, WScreen *scr, WWindow *wwin, XEvent
 		StartWindozeCycle(wwin, event, False, False);
 		break;
 
+	case WKBD_FOCUSLEFT:
+		wSetFocusToDirection(scr, DIRECTION_LEFT);
+		break;
+
+	case WKBD_FOCUSRIGHT:
+		wSetFocusToDirection(scr, DIRECTION_RIGHT);
+		break;
+
+	case WKBD_FOCUSUP:
+		wSetFocusToDirection(scr, DIRECTION_UP);
+		break;
+
+	case WKBD_FOCUSDOWN:
+		wSetFocusToDirection(scr, DIRECTION_DOWN);
+		break;
+
 	case WKBD_GROUPNEXT:
 		StartWindozeCycle(wwin, event, True, True);
 		break;
@@ -1975,6 +1997,29 @@ static void dispatchWKBDCommand(int command, WScreen *scr, WWindow *wwin, XEvent
 		}
 		break;
 #endif	/* KEEP_XKB_LOCK_STATUS */
+
+	case WKBD_MARK_SET:
+		if (ISMAPPED(wwin) && ISFOCUSED(wwin))
+			startMarkCapture(scr, dpy, MARK_CAPTURE_SET);
+		break;
+
+	case WKBD_MARK_UNSET:
+		if (ISMAPPED(wwin) && ISFOCUSED(wwin) && wwin->mark_key_label != NULL)
+			wWindowUnsetMark(wwin);
+		break;
+
+	case WKBD_MARK_BRING:
+		startMarkCapture(scr, dpy, MARK_CAPTURE_BRING);
+		break;
+
+	case WKBD_MARK_JUMP:
+		startMarkCapture(scr, dpy, MARK_CAPTURE_JUMP);
+		break;
+
+	case WKBD_MARK_SWAP:
+		if (ISMAPPED(wwin) && ISFOCUSED(wwin))
+			startMarkCapture(scr, dpy, MARK_CAPTURE_SWAP);
+		break;
 	}
 }
 
@@ -1990,6 +2035,118 @@ static void handleKeyPress(XEvent * event)
 	/* ignore CapsLock */
 	modifiers = event->xkey.state & w_global.shortcut.modifiers_mask;
 
+	/* ----------------------------------------------------------- *
+	* Window mark capture mode                                     *
+	*                                                              *
+	* We grabbed the keyboard so all keypresses come here until    *
+	* we release the grab.                                         *
+	* ------------------------------------------------------------ */
+	if (scr->flags.mark_capture_mode != MARK_CAPTURE_IDLE) {
+		int capture_mode = scr->flags.mark_capture_mode;
+		KeySym cap_ksym;
+		char label[MAX_SHORTCUT_LENGTH];
+
+		/* Skip modifier-only keypresses */
+		cap_ksym = XLookupKeysym(&event->xkey, 0);
+		if (cap_ksym == NoSymbol || IsModifierKey(cap_ksym))
+			return;
+
+		/* Real key received: exit capture mode and release grab */
+		scr->flags.mark_capture_mode = MARK_CAPTURE_IDLE;
+		XUngrabKeyboard(dpy, CurrentTime);
+
+		if (!GetCanonicalShortcutLabel(modifiers, cap_ksym, label, sizeof(label)))
+			wstrlcpy(label, "?", sizeof(label));
+
+		if (capture_mode == MARK_CAPTURE_SET) {
+			WWindow *target = scr->focused_window;
+			Bool conflict = False;
+			int i;
+
+			/* Conflict check against static wmaker bindings */
+			for (i = 0; i < WKBD_LAST; i++) {
+				if (wKeyBindings[i].keycode == event->xkey.keycode && wKeyBindings[i].modifier == modifiers) {
+					wwarning("window mark: '%s' is already a wmaker binding, mark not assigned", label);
+					conflict = True;
+					break;
+				}
+			}
+
+			/* Conflict check against existing marks on other windows */
+			if (!conflict) {
+				WWindow *tw = scr->focused_window;
+				while (tw) {
+					if (tw != target && tw->mark_key_label != NULL && strcmp(tw->mark_key_label, label) == 0) {
+						wwarning("window mark: label '%s' is already used by another window, mark not assigned", label);
+						conflict = True;
+						break;
+					}
+					tw = tw->prev;
+				}
+			}
+
+			if (!conflict && target != NULL)
+				wWindowSetMark(target, label);
+
+		} else {
+			/* Find marked window by label */
+			WWindow *tw = scr->focused_window;
+
+			while (tw) {
+				if (tw->mark_key_label != NULL && strcmp(tw->mark_key_label, label) == 0)
+					break;
+				tw = tw->prev;
+			}
+			if (tw == NULL) {
+				wwarning("window mark: no window labelled '%s'", label);
+			} else if (capture_mode == MARK_CAPTURE_BRING) {
+				if (tw->frame->workspace != scr->current_workspace)
+					wWindowChangeWorkspace(tw, scr->current_workspace);
+				wMakeWindowVisible(tw);
+			} else if (capture_mode == MARK_CAPTURE_JUMP) {
+				wMakeWindowVisible(tw);
+			} else {
+				/* MARK_CAPTURE_SWAP: swap position, size and workspace between focused and tw */
+				WWindow *focused = scr->focused_window;
+				int fx, fy, fw, fh, tx, ty, tw_w, tw_h;
+				int f_ws, t_ws;
+
+				if (focused == NULL || focused == tw)
+					return;
+
+				/* Snapshot both geometries */
+				fx   = focused->frame_x;
+				fy   = focused->frame_y;
+				fw   = focused->client.width;
+				fh   = focused->client.height;
+				f_ws = focused->frame->workspace;
+
+				tx   = tw->frame_x;
+				ty   = tw->frame_y;
+				tw_w = tw->client.width;
+				tw_h = tw->client.height;
+				t_ws = tw->frame->workspace;
+
+				/* Swap workspaces first so configure lands in the right one */
+				if (f_ws != t_ws) {
+					wWindowChangeWorkspace(focused, t_ws);
+					wWindowChangeWorkspace(tw, f_ws);
+				}
+
+				/* Swap positions and sizes */
+				wWindowConfigure(focused, tx, ty, tw_w, tw_h);
+				wWindowConfigure(tw, fx, fy, fw, fh);
+
+				/* Follow origin window: switch view to the workspace it landed in,
+				* then restore focus to it */
+				if (f_ws != t_ws)
+					wWorkspaceChange(scr, t_ws);
+				wSetFocusTo(scr, focused);
+			}
+		}
+		return;
+	}
+
 	/* ------------------------------------------------------------------ *
 	 * Trie-based key-chain matching                                      *
 	 *                                                                    *

src/keybind.h

@@ -77,9 +77,18 @@ enum {
 	WKBD_WORKSPACEMAP,
 	WKBD_FOCUSNEXT,
 	WKBD_FOCUSPREV,
+	WKBD_FOCUSLEFT,
+	WKBD_FOCUSRIGHT,
+	WKBD_FOCUSUP,
+	WKBD_FOCUSDOWN,
 	WKBD_GROUPNEXT,
 	WKBD_GROUPPREV,
 	WKBD_CENTRAL,
+	WKBD_MARK_SET,
+	WKBD_MARK_UNSET,
+	WKBD_MARK_BRING,
+	WKBD_MARK_JUMP,
+	WKBD_MARK_SWAP,
 
 	/* window, menu */
 	WKBD_CLOSE,

src/misc.c

@@ -847,6 +847,34 @@ static char *keysymToString(KeySym keysym, unsigned int state)
 }
 #endif
 
+Bool GetCanonicalShortcutLabel(unsigned int modifiers, KeySym ksym, char *buf, size_t bufsz)
+{
+	static const struct { unsigned int mask; const char *name; } mt[] = {
+		{ ShiftMask,   "Shift+"   },
+		{ ControlMask, "Control+" },
+		{ Mod1Mask,    "Mod1+"    },
+		{ Mod2Mask,    "Mod2+"    },
+		{ Mod3Mask,    "Mod3+"    },
+		{ Mod4Mask,    "Mod4+"    },
+		{ Mod5Mask,    "Mod5+"    },
+		{ 0, NULL }
+	};
+	const char *kname = XKeysymToString(ksym);
+	size_t i;
+
+	if (!kname)
+		return False;
+
+	buf[0] = '\0';
+	for (i = 0; mt[i].mask; i++) {
+		if (modifiers & mt[i].mask)
+			wstrlcat(buf, mt[i].name, bufsz);
+	}
+	wstrlcat(buf, kname, bufsz);
+
+	return True;
+}
+
 char *GetShortcutString(const char *shortcut)
 {
 	char *buffer = NULL;
@@ -882,50 +910,12 @@ char *GetShortcutString(const char *shortcut)
 char *GetShortcutKey(WShortKey key)
 {
 	char buf[MAX_SHORTCUT_LENGTH];
-	char *wr, *result, *seg;
+	char *result, *seg;
 	int step;
 
-	void append_string(const char *text)
-	{
-		const char *s = text;
-
-		while (*s) {
-			if (wr >= buf + sizeof(buf) - 1)
-				break;
-			*wr++ = *s++;
-		}
-	}
-
-	void append_modifier(int modifier_index, const char *fallback_name)
-	{
-		if (wPreferences.modifier_labels[modifier_index])
-			append_string(wPreferences.modifier_labels[modifier_index]);
-		else
-			append_string(fallback_name);
-	}
-
-	Bool build_token(unsigned int mod, KeyCode kcode)
-	{
-		const char *kname = XKeysymToString(W_KeycodeToKeysym(dpy, kcode, 0));
-
-		if (!kname)
-			return False;
-
-		wr = buf;
-		if (mod & ControlMask) append_modifier(1, "Control+");
-		if (mod & ShiftMask)   append_modifier(0, "Shift+");
-		if (mod & Mod1Mask)    append_modifier(2, "Mod1+");
-		if (mod & Mod2Mask)    append_modifier(3, "Mod2+");
-		if (mod & Mod3Mask)    append_modifier(4, "Mod3+");
-		if (mod & Mod4Mask)    append_modifier(5, "Mod4+");
-		if (mod & Mod5Mask)    append_modifier(6, "Mod5+");
-		append_string(kname);
-		*wr = '\0';
-
-		return True;
-	}
-
-	if (!build_token(key.modifier, key.keycode))
+	if (!GetCanonicalShortcutLabel(key.modifier,
+				       W_KeycodeToKeysym(dpy, key.keycode, 0),
+				       buf, sizeof(buf)))
 		return NULL;
 
 	/* Convert the leader token to its display string */
@@ -938,7 +928,9 @@ char *GetShortcutKey(WShortKey key)
 		if (key.chain_keycodes[step] == 0)
 			break;
 
-		if (!build_token(key.chain_modifiers[step], key.chain_keycodes[step]))
+		if (!GetCanonicalShortcutLabel(key.chain_modifiers[step],
+					       W_KeycodeToKeysym(dpy, key.chain_keycodes[step], 0),
+					       buf, sizeof(buf)))
 			break;
 
 		seg = GetShortcutString(buf);

src/misc.h

@@ -50,6 +50,7 @@ char *ExpandOptions(WScreen * scr, const char *cmdline);
 void ExecuteInputCommand(WScreen *scr, const char *cmdline);
 void ExecuteExitCommand(WScreen *scr, long quickmode);
 char *GetShortcutString(const char *text);
+Bool GetCanonicalShortcutLabel(unsigned int modifiers, KeySym ksym, char *buf, size_t bufsz);
 char *GetShortcutKey(WShortKey key);
 char *EscapeWM_CLASS(const char *name, const char *class);
 char *StrConcatDot(const char *a, const char *b);

src/screen.h

@@ -59,6 +59,14 @@ typedef struct WDrawerChain {
     struct WDrawerChain *next;
 } WDrawerChain;
 
+typedef enum {
+    MARK_CAPTURE_IDLE  = 0,
+    MARK_CAPTURE_SET   = 1,
+    MARK_CAPTURE_BRING = 2,
+    MARK_CAPTURE_JUMP  = 3,
+    MARK_CAPTURE_SWAP  = 4
+} WMarkCaptureMode;
+
 /*
  * each WScreen is saved into a context associated with its root window
  */
@@ -332,6 +340,8 @@ typedef struct _WScreen {
         unsigned int jump_back_pending:1;
         unsigned int ignore_focus_events:1;
         unsigned int in_hot_corner:3;
+        unsigned int mark_capture_mode:3;  /* one of WMarkCaptureMode */
+
     } flags;
 } WScreen;
 

src/session.c

@@ -97,6 +97,7 @@ static WMPropList *sMaximized;
 static WMPropList *sHidden;
 static WMPropList *sGeometry;
 static WMPropList *sShortcutMask;
+static WMPropList *sMarkKey;
 
 static WMPropList *sDock;
 static WMPropList *sYes, *sNo;
@@ -118,6 +119,7 @@ static void make_keys(void)
 	sGeometry = WMCreatePLString("Geometry");
 	sDock = WMCreatePLString("Dock");
 	sShortcutMask = WMCreatePLString("ShortcutMask");
+	sMarkKey = WMCreatePLString("MarkKey");
 
 	sYes = WMCreatePLString("Yes");
 	sNo = WMCreatePLString("No");
@@ -165,6 +167,7 @@ static WMPropList *makeWindowState(WWindow * wwin, WApplication * wapp)
 	WMPropList *win_state, *cmd, *name, *workspace;
 	WMPropList *shaded, *miniaturized, *maximized, *hidden, *geometry;
 	WMPropList *dock, *shortcut;
+	WMPropList *mark_key_pl = NULL;
 
 	if (wwin->orig_main_window != None && wwin->orig_main_window != wwin->client_win)
 		win = wwin->orig_main_window;
@@ -215,6 +218,9 @@ static WMPropList *makeWindowState(WWindow * wwin, WApplication * wapp)
 		snprintf(buffer, sizeof(buffer), "%u", mask);
 		shortcut = WMCreatePLString(buffer);
 
+		if (wwin->mark_key_label)
+			mark_key_pl = WMCreatePLString(wwin->mark_key_label);
+
 		win_state = WMCreatePLDictionary(sName, name,
 						 sCommand, cmd,
 						 sWorkspace, workspace,
@@ -224,6 +230,11 @@ static WMPropList *makeWindowState(WWindow * wwin, WApplication * wapp)
 						 sHidden, hidden,
 						 sShortcutMask, shortcut, sGeometry, geometry, NULL);
 
+		if (mark_key_pl) {
+			WMPutInPLDictionary(win_state, sMarkKey, mark_key_pl);
+			WMReleasePropList(mark_key_pl);
+		}
+
 		WMReleasePropList(name);
 		WMReleasePropList(cmd);
 		WMReleasePropList(workspace);
@@ -418,6 +429,13 @@ static WSavedState *getWindowState(WScreen * scr, WMPropList * win_state)
 		state->window_shortcuts = mask;
 	}
 
+	value = WMGetFromPLDictionary(win_state, sMarkKey);
+	if (value != NULL && WMIsPLString(value)) {
+		char *s = WMGetFromPLString(value);
+		if (s && *s)
+			state->mark_key = wstrdup(s);
+	}
+
 	value = WMGetFromPLDictionary(win_state, sGeometry);
 	if (value && WMIsPLString(value)) {
 		if (!(sscanf(WMGetFromPLString(value), "%ix%i+%i+%i",
@@ -531,6 +549,8 @@ void wSessionRestoreState(WScreen *scr)
 		} else if ((pid = execCommand(scr, command)) > 0) {
 			wWindowAddSavedState(instance, class, command, pid, state);
 		} else {
+			if (state->mark_key)
+				wfree(state->mark_key);
 			wfree(state);
 		}
 

src/startup.c

@@ -387,6 +387,7 @@ static char *atomNames[] = {
 	"_WINDOWMAKER_COMMAND",
 	"_WINDOWMAKER_ICON_SIZE",
 	"_WINDOWMAKER_ICON_TILE",
+	"_WINDOWMAKER_MARK_KEY",
 
 	GNUSTEP_WM_ATTR_NAME,
 	GNUSTEP_WM_MINIATURIZE_WINDOW,
@@ -474,6 +475,7 @@ void StartUp(Bool defaultScreenOnly)
 	w_global.atom.desktop.gtk_object_path = atom[20];
 
 	w_global.atom.wm.ignore_focus_events = atom[21];
+	w_global.atom.wmaker.mark_key  = atom[22];
 
 #ifdef USE_DOCK_XDND
 	wXDNDInitializeAtoms();

src/switchmenu.c

@@ -44,6 +44,8 @@
 	((w)->wm_gnustep_attr->window_level == WMMainMenuWindowLevel || \
 	 (w)->wm_gnustep_attr->window_level == WMSubmenuWindowLevel))
 
+#define MAX_RTEXT_LENGTH (MAX_WORKSPACENAME_WIDTH + MAX_SHORTCUT_LENGTH + 16)
+
 static int initialized = 0;
 static void observer(void *self, WMNotification * notif);
 static void wsobserver(void *self, WMNotification * notif);
@@ -214,6 +216,26 @@ static int menuIndexForWindow(WMenu * menu, WWindow * wwin, int old_pos)
 	return idx;
 }
 
+static void fillRtext(char *buf, size_t bufsz, WWindow *wwin, WScreen *scr)
+{
+	char *mlbl = wwin->mark_key_label ? GetShortcutString(wwin->mark_key_label) : NULL;
+
+	if (IS_OMNIPRESENT(wwin)) {
+		if (mlbl)
+			snprintf(buf, bufsz, "[%s] [*]", mlbl);
+		else
+			snprintf(buf, bufsz, "[*]");
+	} else {
+		if (mlbl)
+			snprintf(buf, bufsz, "[%s] [%s]", mlbl,
+				 scr->workspaces[wwin->frame->workspace]->name);
+		else
+			snprintf(buf, bufsz, "[%s]",
+				 scr->workspaces[wwin->frame->workspace]->name);
+	}
+	wfree(mlbl);
+}
+
 /*
  * Update switch menu
  */
@@ -263,12 +285,8 @@ void UpdateSwitchMenu(WScreen * scr, WWindow * wwin, int action)
 		entry->icon = switchMenuIconForWindow(scr, wwin);
 
 		entry->flags.indicator = 1;
-		entry->rtext = wmalloc(MAX_WORKSPACENAME_WIDTH + 8);
-		if (IS_OMNIPRESENT(wwin))
-			snprintf(entry->rtext, MAX_WORKSPACENAME_WIDTH, "[*]");
-		else
-			snprintf(entry->rtext, MAX_WORKSPACENAME_WIDTH, "[%s]",
-				 scr->workspaces[wwin->frame->workspace]->name);
+		entry->rtext = wmalloc(MAX_RTEXT_LENGTH);
+		fillRtext(entry->rtext, MAX_RTEXT_LENGTH, wwin, scr);
 
 		if (wwin->flags.hidden) {
 			entry->flags.indicator_type = MI_HIDDEN;
@@ -311,6 +329,8 @@ void UpdateSwitchMenu(WScreen * scr, WWindow * wwin, int action)
 					t = ShrinkString(scr->menu_entry_font, title, MAX_WINDOWLIST_WIDTH);
 					entry->text = t;
 
+					fillRtext(entry->rtext, MAX_RTEXT_LENGTH, wwin, scr);
+
 					wMenuRealize(switchmenu);
 					checkVisibility = 1;
 					break;
@@ -322,13 +342,7 @@ void UpdateSwitchMenu(WScreen * scr, WWindow * wwin, int action)
 						WPixmap *ipix;
 						int it, ion;
 
-						if (IS_OMNIPRESENT(wwin)) {
-							snprintf(entry->rtext, MAX_WORKSPACENAME_WIDTH, "[*]");
-						} else {
-							snprintf(entry->rtext, MAX_WORKSPACENAME_WIDTH,
-								 "[%s]",
-								 scr->workspaces[wwin->frame->workspace]->name);
-						}
+						fillRtext(entry->rtext, MAX_RTEXT_LENGTH, wwin, scr);
 
 						rt = entry->rtext;
 						entry->rtext = NULL;
@@ -404,11 +418,7 @@ static void UpdateSwitchMenuWorkspace(WScreen *scr, int workspace)
 		wwin = (WWindow *) menu->entries[i]->clientdata;
 
 		if (wwin->frame->workspace == workspace && !IS_OMNIPRESENT(wwin)) {
-			if (IS_OMNIPRESENT(wwin))
-				snprintf(menu->entries[i]->rtext, MAX_WORKSPACENAME_WIDTH, "[*]");
-			else
-				snprintf(menu->entries[i]->rtext, MAX_WORKSPACENAME_WIDTH, "[%s]",
-					 scr->workspaces[wwin->frame->workspace]->name);
+			fillRtext(menu->entries[i]->rtext, MAX_RTEXT_LENGTH, wwin, scr);
 			menu->flags.realized = 0;
 		}
 	}

src/window.c

@@ -75,6 +75,7 @@
 #include "startup.h"
 #include "winmenu.h"
 #include "osdep.h"
+#include "switchmenu.h"
 
 #ifdef USE_MWM_HINTS
 # include "motif.h"
@@ -200,6 +201,10 @@ void wWindowDestroy(WWindow *wwin)
 		}
 	}
 
+	/* clean up any mark assigned to this window */
+	if (wwin->mark_key_label != NULL)
+		wWindowUnsetMark(wwin);
+
 	if (wwin->fake_group && wwin->fake_group->retainCount > 0) {
 		wwin->fake_group->retainCount--;
 		if (wwin->fake_group->retainCount == 0 && wwin->fake_group->leader != None) {
@@ -465,6 +470,35 @@ void wWindowSetupInitialAttributes(WWindow *wwin, int *level, int *workspace)
 		wwin->client_flags.no_focusable = 1;
 }
 
+/*
+ * Returns True if every pixel of 'wwin' is covered by at least one other
+ * mapped window on the same workspace, making it invisible to the user
+ */
+Bool wWindowIsFullyCovered(WWindow *wwin)
+{
+	WScreen *scr = wwin->screen_ptr;
+	int cx = wwin->frame_x;
+	int cy = wwin->frame_y;
+	int cright  = cx + (int)wwin->frame->core->width;
+	int cbottom = cy + (int)wwin->frame->core->height;
+	WWindow *w;
+
+	for (w = scr->focused_window; w != NULL; w = w->prev) {
+		if (w == wwin)
+			continue;
+		if (!w->flags.mapped)
+			continue;
+		if (!w->frame || w->frame->workspace != scr->current_workspace)
+			continue;
+		if (w->frame_x <= cx &&
+		    w->frame_y <= cy &&
+		    w->frame_x + (int)w->frame->core->width  >= cright &&
+		    w->frame_y + (int)w->frame->core->height >= cbottom)
+			return True;
+	}
+	return False;
+}
+
 Bool wWindowObscuresWindow(WWindow *wwin, WWindow *obscured)
 {
 	int w1, h1, w2, h2;
@@ -1006,9 +1040,18 @@ WWindow *wManageWindow(WScreen *scr, Window window)
 			}
 		}
 
-		if (wstate != NULL)
+		/* restore mark: prefer session state, fall back to warm-restart hint */
+		if (win_state != NULL && win_state->state->mark_key != NULL)
+			wWindowSetMark(wwin, win_state->state->mark_key);
+		else if (wstate != NULL && wstate->mark_key != NULL)
+			wWindowSetMark(wwin, wstate->mark_key);
+
+		if (wstate != NULL) {
+			if (wstate->mark_key != NULL)
+				wfree(wstate->mark_key);
 			wfree(wstate);
 		}
+	}
 
 	/* don't let transients start miniaturized if their owners are not */
 	if (transientOwner && !transientOwner->flags.miniaturized && wwin->flags.miniaturized && !withdraw) {
@@ -2527,6 +2570,14 @@ void wWindowSaveState(WWindow *wwin)
 
 	XChangeProperty(dpy, wwin->client_win, w_global.atom.wmaker.state,
 			w_global.atom.wmaker.state, 32, PropModeReplace, (unsigned char *)data, 10);
+
+	if (wwin->mark_key_label != NULL)
+		XChangeProperty(dpy, wwin->client_win, w_global.atom.wmaker.mark_key,
+					XA_STRING, 8, PropModeReplace,
+					(unsigned char *)wwin->mark_key_label,
+					strlen(wwin->mark_key_label));
+	else
+		XDeleteProperty(dpy, wwin->client_win, w_global.atom.wmaker.mark_key);
 }
 
 static int getSavedState(Window window, WSavedState ** state)
@@ -2536,6 +2587,7 @@ static int getSavedState(Window window, WSavedState ** state)
 	unsigned long nitems_ret;
 	unsigned long bytes_after_ret;
 	long *data;
+	unsigned char *mk_data = NULL;
 
 	if (XGetWindowProperty(dpy, window, w_global.atom.wmaker.state, 0, 10,
 			       True, w_global.atom.wmaker.state,
@@ -2563,6 +2615,15 @@ static int getSavedState(Window window, WSavedState ** state)
 
 	XFree(data);
 
+	(*state)->mark_key = NULL;
+	if (XGetWindowProperty(dpy, window, w_global.atom.wmaker.mark_key, 0, 256,
+							True, XA_STRING, &type_ret, &fmt_ret, &nitems_ret, &bytes_after_ret,
+							&mk_data) == Success && mk_data && nitems_ret > 0 && type_ret == XA_STRING)
+		(*state)->mark_key = wstrdup((char *)mk_data);
+
+	if (mk_data)
+		XFree(mk_data);
+
 	return 1;
 }
 
@@ -2889,6 +2950,9 @@ static void release_wwindowstate(WWindowState *wstate)
 	if (wstate->command)
 		wfree(wstate->command);
 
+	if (wstate->state && wstate->state->mark_key)
+		wfree(wstate->state->mark_key);
+
 	wfree(wstate->state);
 	wfree(wstate);
 }
@@ -2902,6 +2966,29 @@ void wWindowSetOmnipresent(WWindow *wwin, Bool flag)
 	WMPostNotificationName(WMNChangedState, wwin, "omnipresent");
 }
 
+void wWindowSetMark(WWindow *wwin, const char *label)
+{
+	/* Remove any previous mark first */
+	if (wwin->mark_key_label != NULL)
+		wWindowUnsetMark(wwin);
+
+	wwin->mark_key_label = wstrdup(label);
+
+	UpdateSwitchMenu(wwin->screen_ptr, wwin, ACTION_CHANGE);
+}
+
+void wWindowUnsetMark(WWindow *wwin)
+{
+	if (wwin->mark_key_label == NULL)
+		return;
+
+	wfree(wwin->mark_key_label);
+	wwin->mark_key_label = NULL;
+
+	UpdateSwitchMenu(wwin->screen_ptr, wwin, ACTION_CHANGE);
+}
+
+
 static void resizebarMouseDown(WCoreWindow *sender, void *data, XEvent *event)
 {
 	WWindow *wwin = data;

src/window.h

@@ -299,6 +299,7 @@ typedef struct WWindow {
 	int icon_w, icon_h;
 	RImage *net_icon_image;			/* Window Image */
 	Atom type;
+	char *mark_key_label;		/* Vim-like Window Marking */
 } WWindow;
 
 #define HAS_TITLEBAR(w)		(!(WFLAGP((w), no_titlebar) || (w)->flags.fullscreen))
@@ -323,6 +324,7 @@ typedef struct WSavedState {
     unsigned int w;
     unsigned int h;
     unsigned window_shortcuts; /* mask like 1<<shortcut_number */
+	char *mark_key;	/* serialised mark key label */
 } WSavedState;
 
 typedef struct WWindowState {
@@ -403,10 +405,15 @@ WMagicNumber wWindowGetSavedState(Window win);
 
 void wWindowDeleteSavedState(WMagicNumber id);
 
+Bool wWindowIsFullyCovered(WWindow *wwin);
 Bool wWindowObscuresWindow(WWindow *wwin, WWindow *obscured);
 
 void wWindowSetOmnipresent(WWindow *wwin, Bool flag);
 
+/* Vim-like window marking management */
+void wWindowSetMark(WWindow *wwin, const char *label);
+void wWindowUnsetMark(WWindow *wwin);
+
 #ifdef XKB_BUTTON_HINT
 void wWindowGetLanguageLabel(int group_index, char *label);
 #endif

src/wmspec.c

@@ -1535,7 +1535,7 @@ void wNETWMCheckClientHints(WWindow *wwin, int *layer, int *workspace)
 		XFree(data);
 	}
 
-	if (XGetWindowProperty(dpy, wwin->client_win, net_wm_window_type, 0, 1, False,
+	if (XGetWindowProperty(dpy, wwin->client_win, net_wm_window_type, 0, 1024L, False,
 			       XA_ATOM, &type_ret, &fmt_ret, &nitems_ret,
 			       &bytes_after_ret, (unsigned char **)&data) == Success && data) {