Add Undo/Redo support to the Find and Replace windows
Don't understand.
![Screenshot from 2020-05-09 11-40-17](https://user-images.githubusercontent.com/24701640/81470208-e397b800-91e9-11...)
![Screenshot from 2020-05-09 11-42-05](https://user-images.githubusercontent.com/24701640/81470251-2194dc00-91ea-11...)
Editing of fields in dialog boxes is handled by the GTK toolkit, Geany only sees the end result when one of the buttons is pressed. So you would probably need to take it up with the GTK project.
Closed #2499.
https://gitlab.gnome.org/GNOME/gtk/issues/1690
TLDR; not gonna happen for GTK3 but already implemented in GTK4.
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