For consistency with the other platforms, coalesce multiple wxEVT_TEXT
events resulting from a single user action into a single one in wxGTK
too. For example, when pressing a key in a control with some text
selected, wxGTK previously generated 2 wxEVT_TEXT events: one
corresponding to the removal of the selection and another one to the
addition of the new text. Now only a single event with the new text is
generated, as in the other ports.
Doing this requires delaying sending wxEVT_TEXT until GTK itself ends
handling the key press, however we delay it as little as possible, so
hopefully this shouldn't have any visible effects at wx API level.
Closes#10050.
2c6dcc2e51