Add :tabreattach.

The name is not very convincing.

common/content/liberator.js

@@ -897,6 +897,11 @@ const liberator = (function () //{{{
             context.keys = { text: function (item) item.getAttribute("toolbarname"), description: function () "" };
             context.completions = buffer.evaluateXPath("./*[@toolbarname]", document, toolbox);
         };
+
+        completion.window = function window(context) {
+            context.title = ["Window", "Title"]
+            context.completions = [[i, win.document.title] for ([i, win] in Iterator(liberator.windows))];
+        };
     });
 
     /////////////////////////////////////////////////////////////////////////////}}}

common/content/tabs.js

@@ -617,6 +617,43 @@ function Tabs() //{{{
                 bang: true,
                 count: true
             });
+
+        // TODO: match window by title too?
+        //     : accept the full :tabmove arg spec for the tab index arg?
+        //     : better name or merge with :tabmove?
+        commands.add(["tabrea[ttach]"],
+            "Reattach the current tab to another window",
+            function (args)
+            {
+                if (args.length > 2 || args.some(function (i) i && !/^\d+$/.test(i)))
+                    return void liberator.echoerr("E488: Trailing characters");
+
+                let [winIndex, tabIndex] = args;
+                let win = liberator.windows[winIndex];
+
+                if (!win)
+                    return void liberator.echoerr("Window " + winIndex + " does not exist");
+                else if (win == window)
+                    return void liberator.echoerr("Can't reattach to the same window");
+
+                let browser = win.getBrowser();
+                let dummy = browser.addTab("about:blank");
+                let last = browser.mTabs.length - 1;
+
+                browser.moveTabTo(dummy, util.Math.constrain(tabIndex || last, 0, last));
+                browser.selectedTab = dummy; // required
+                browser.stop();
+                browser.docShell;
+                browser.swapBrowsersAndCloseOther(dummy, getBrowser().mCurrentTab);
+            },
+            {
+                argCount: "+",
+                completer: function (context, args)
+                {
+                    if (args.completeArg == 0)
+                        completion.window(context);
+                }
+            });
     }
 
     if (liberator.has("tabs_undo"))

vimperator/NEWS

@@ -19,6 +19,7 @@
        know if I like copying bugs)
     * IMPORTANT: 'popups' now takes a stringlist rather than a number.
 
+    * add [c]:tabattach[c]
     * add [c]:keepalt[c]
     * add [c]:styledisable[c], [c]:styleenable[c], and [c]:styletoggle[c]
     * add [c]:sanitize[c], 'sanitizetimespan' and 'sanitizeitems'

vimperator/locale/en-US/index.txt

@@ -259,6 +259,7 @@ section::Ex{nbsp}commands[ex-cmd-index,:index]
 ||[c]:tabonly[c]|| Close all other tabs +
 ||[c]:tabopen[c]|| Open one or more URLs in a new tab +
 ||[c]:tabprevious[c]|| Switch to the previous tab or go [count] tabs back +
+||[c]:tabreattach[c]|| Reattach the current tab to another window +
 ||[c]:tabrewind[c]|| Switch to the first tab +
 ||[c]:time[c]|| Profile a piece of code or run a command multiple times +
 ||[c]toolbarhide[c]|| Hide the named toolbar +

vimperator/locale/en-US/tabs.txt

@@ -160,6 +160,16 @@ contain at least one tab it is not possible to detach the only tab in a window.
 Use [c]:tabduplicate[c] to copy the tab then call [c]:tabdetach[c].
 ________________________________________________________________________________
 
+
+|:tabrea| |:tabreattach|
+||:tabrea[ttach] {window-index} [tab-index]|| +
+________________________________________________________________________________
+Reattach the current tab to another window. {window-index} is an index into the
+list of open windows and [a][tab-index][a] is the index at which to insert the
+tab in the other window's tab list. If this is the last tab in a window, the
+window will be closed.
+________________________________________________________________________________
+
 section::Reordering{nbsp}tabs[reordering-tabs]
 
 |:tabm| |:tabmove|

xulmus/locale/en-US/index.txt

@@ -305,6 +305,7 @@ section::Ex{nbsp}commands[ex-cmd-index,:index]
 ||[c]:tabonly[c]|| Close all other tabs +
 ||[c]:tabopen[c]|| Open one or more URLs in a new tab +
 ||[c]:tabprevious[c]|| Switch to the previous tab or go [count] tabs back +
+||[c]:tabreattach[c]|| Reattach the current tab to another window +
 ||[c]:tabrewind[c]|| Switch to the first tab +
 ||[c]:time[c]|| Profile a piece of code or run a command multiple times +
 ||[c]toolbarhide[c]|| Hide the named toolbar +

xulmus/locale/en-US/tabs.txt

@@ -151,6 +151,16 @@ contain at least one tab it is not possible to detach the only tab in a window.
 Use [c]:tabduplicate[c] to copy the tab then call [c]:tabdetach[c].
 ________________________________________________________________________________
 
+
+|:tabrea| |:tabreattach|
+||:tabrea[ttach] {window-index} [tab-index]|| +
+________________________________________________________________________________
+Reattach the current tab to another window. {window-index} is an index into the
+list of open windows and [a][tab-index][a] is the index at which to insert the
+tab in the other window's tab list. If this is the last tab in a window, the
+window will be closed.
+________________________________________________________________________________
+
 section::Reordering{nbsp}tabs[reordering-tabs]
 
 |:tabm| |:tabmove|