ralf3u left a comment (geany/geany#4251)
If the shortcut `Toggle between only editor and only sidebar` is pressed, then the shortcut should first verify if one of both (editor or sidebar) is disabled. If this is not possible to code because the editor can't be disabled, then maybe this could be a solution: If the shortcut `Toggle between only editor and only sidebar` is pressed, then the shortcut should first verify if either sidebar is disabled or sidebar has a width of 100%.
I forgot to mention the reason. The reason is: If editor&sidebar is visible, and then if the shortcut `Toggle between only editor and only sidebar` is pressed, then nothing should happen, because the shortcut should do exactly what the shortcut is saying: `Toggle between only editor and only sidebar`.
By the way, today I opened the issue 4252 at Geany. If someone will fix 4251, then it would be good to fix also 4252, because there is some kind of similarity.