Fix crash after deleting style or preset that was selected in shortcuts dialog #18244
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fixes #18241 (both the crash, which could also happen when deleting presets, and the styles shortcut being removed when overwriting).
This also cherry-picks a commit from ancil that shows tooltips assigned to styles when hovering over them in the styles module and allows assigning shortcuts in visual mapping mode (or directly going to the style in shortcuts dialog by selecting mapping mode and clicking on the style in the module's list). @TurboGit you may find this too invasive for 5.0.1