** Tab Bars and Tab Lines
+*** The tab bar now supports more mouse commands.
+Clicking 'mouse-2' closes the tab, 'mouse-3' displays the context menu
+with items that operate on the clicked tab. Dragging the tab with
+'mouse-1' moves it to another position on the tab bar. Mouse wheel
+scrolling switches to the previous/next tab, and holding the Shift key
+during scrolling moves the tab to the left/right.
+
*** The prefix key 'C-x t t' can be used to display a buffer in a new tab.
Typing 'C-x t t' before a command will cause the buffer shown by that
command to be displayed in a new tab. 'C-x t t" is bound to the