Add menu mnemonics

[stefanschramm]

Adds mnemonics (shortcuts) to menus and menu entries to improve keyboard navigation

[stefanschramm]

Mnemonics for well-known actions are inspired by the Kate editor

[ptsouchlos]

Sorry but I'm not familiar with the purpose of this. Is it to make the menu items easier to read? Also how are the letters selected to be underlined or not? It appears a bit arbitrary to me at a first look, but I assume that is due to a lack of knowledge on my part.

[stefanschramm]

Hi! It's to make the menus keyboard-accessible. For example the user can press Alt+F to open the file menu and then I for "Open with". It's explained here: https://doc.qt.io/qt-6/qaction.html#text-prop

I think it is considered a good-practice to give all menus/actions these mnemonics. You see them in nearly all (Qt) applications.

Usually the first letter is used, but in some cases it's more reasonable to use another one when there are multiple entries with the same starting letter.

[ptsouchlos]

Interesting, thanks for the link.

Most of these shortcuts don't work for me as I am on Hyprland and have many conflicting keyboard shortcuts, but I think this is a positive change for the software. Eventually, we do want customizable shortcuts, but that can come at a later time.