Meta+Shift+<0..9> shortcuts by default, but these defaults are not working yet!
Plasma already has Meta+<0..9> keyboard shortcuts to "activate" the applications in the taskbar/task manager. But if an application is the taskbar already has a window open, that shortcut will show and focus that window, and not open a new window (which is OK).
These Meta+Shift+<0..9> shortcuts would allow opening a new window when there is already a window open of that application using only the keyboard (in the icon-only task manager). Windows and some other Linux desktops also have these shortcuts.
This merge request is to help fix this feature request, and depends on this merge request for plasma-desktop.
With these changes, the Meta+Shift+1..9 shortcuts actually appear in the Keyboard Shortcuts settings, but the default shortcuts are not working. If I then manually assign the combination Meta+Shift+1 in the Keyboard Shortcuts settings, it actually shows as Meta+! (for my keyboard), and then the shortcut works. I'm not knowledgeable enough in Qt/KDE to fix that.