Feature request: Select text of element's labels by Ctrl-A

[Igor Zhbanov <izh1979 gmail com>]

Hi!

When you drawing a diagram the frequent scenario is to draw it by
copying already drawn
rectangle blocks to preserve colors, fonts and other settings. But
then you need to change
a new element label. So you are pressing F2, and... deleting a label
one-by-one character.
It is a bit annoying.

Or you have to create spare empty rectangles, circles, etc. with
needed visual properties
and copy it.

So it would be great to have a keyboard shortcut allowing to select
all the text of a label
or quickly clear it.

Thank you.