Geany is really a good editor, however I would like to add a small feature, i.e. the ability to save a copy of a file that is being edited.
Indeed, the following situation is very frequent : you are editing a file and you are about to change some important things, but you want to keep a copy of the currents state of the file. What you want to do in such situations is to click on File / Save a copy and save the file under another name, but still editing the current file.
This simple but very useful feature is already in the Scite editor. I tried to implement it myself in Geany but I'm not a GTK programmer and it seems not to be so easy...