[Patch] Add text box shortcut: ctrl+shift+z to redo

[tguen]

Many (most?) programs use ctrl+shift+z to redo rather than ctrl+y. The redo action for the map can be changed in the settings menu, but this doesn't affect text boxes like the tag editor dialog. This patch adds a second shortcut for the redo action in text boxes.

[tguen]

patch

[taylor.smock]

As a stupid question, why didn't you reuse the shortcuts for system:undo and system:redo?

I'll upload a patch of what I am thinking about.

[tguen]

I'd forgotten about this report. I made it the way I did because I'd never read the code before and it was the easiest solution. Yours is clearly better and I hope to see it merged.

[stoecker]

In 19324/josm:

fix #22948 - use redo/undo shortcuts in text boxes, patch by Taylor