Disable the default tab bar menu for the main notebook widget and use a custom menu instead which lists all open files as usual plus 'Close Other Documents' and 'Close All' menu items.
Remove GeanyDocumentPrivate::tabmenu_label.

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@3615 ea778897-0a13-0410-b9d1-a72fbfd435f5