wmaker: Add new options for dragging maximized windows.

You can now configure the behavior when dragging a maximized window by setting
DragMaximizedWindow in ~/GNUstep/Defaults/WindowMaker.  The options are:
- Move: Move the window and retain its maximized status and geometry (the
  current behavior and the default).
- RestoreGeometry: Move the window and unmaximize it, restoring its original
  geometry.
- Unmaximize: Move the window and unmaximize it, retaining its maximized
  geometry.
- NoMove: Don't move the window.

Signed-off-by: Carlos R. Mafra <crmafra@gmail.com>

src/actions.c

@@ -364,6 +364,9 @@ void wMaximizeWindow(WWindow *wwin, int directions)
 	if (!HAS_BORDER(wwin))
 		has_border = 0;
 
+	if (wPreferences.drag_maximized_window == DRAGMAX_NOMOVE)
+		wwin->client_flags.no_movable = 1;
+
 	/* the size to adjust the geometry */
 	adj_size = scr->frame_border_width * 2 * has_border;
 
@@ -681,6 +684,9 @@ void wUnmaximizeWindow(WWindow *wwin)
 		wUnshadeWindow(wwin);
 	}
 
+	if (wPreferences.drag_maximized_window == DRAGMAX_NOMOVE)
+		wwin->client_flags.no_movable = 0;
+
 	/* Use old coordinates if they are set, current values otherwise */
 	remember_geometry(wwin, &x, &y, &w, &h);