For example you can now start entering text in the Properties or
Outliner search, and press the 'x' while the button is still in
text-edit mode.
This way you don't have to exit text editing first, before being able to
quickly clear the string with a mouse click. So this is a small
improvement for convenience.
It also works for the eyedropper (change to picking an object while text
editing) or the '+' and '-' icons in the file saving dialog.
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