[Patch] Fix keyboard navigation (tabbing out of a textarea)

[bj at altern.org]

Currently, if you navigate with the keyboard using tab, navigation is severly 
blocked if you enter a textarea (you can't get out of it).

My patch implements an idea of Waldo Bastian:
By default, tab will get you out of the widget.
A new context menu entry is added to textareas: allow tabulations.

If you toggle the "allow tabulations" feature, pressing tab in the textarea 
will insert a tabulation.

This patch fixes #58247. Is it ok for you ?
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