Bug 461118

A common barrier to my really getting into using KDE activities is the difficulty of moving windows between activities, especially with the keyboard. Activities work well for desktop apps where I can set their default workspace but web browser windows are where it gets annoying for me. I find browser windows often have to activity switch and setting the appropriate visibilities is slow fiddly mouse work [^1]. Especially by comparison with moving a window between virtual desktops which can be easily bound.  

The closet thing that I could find to this suggestion here before was this bug report: https://bugs.kde.org/show_bug.cgi?id=271686 however this seems to miss the fact that windows can be in multiple activities as a commenter on that issue observed. To properly manage window activity visibility with the keyboard we need more than just the concept of 'move' window to activity but 'toggle window visibility in activity x'.

Consider this example set of keyboard shortcuts and actions:

- `Meta+Tab` - cycle activity  
- `Meta+Shift+<x>` where x indicates an activity e.g. I use `c` for communications, `m` for media etc.  
- `Meta+Shift+Ctrl+<x>` Toggle active window visibility in specified activity i.e. the activity with the `Meta+Shift+<x>` where x is the same  
	- Holding `Meta+Shift` could bring up a dialog over the active window like the current 'Show in activities' option in the rightclick on the titlebar dropdown.  
	- `Meta+Shift+Ctrl+a` could be used for 'show in all'  

This would need keyboard shortcuts for:  
	- 'toggle window visibility in activity x'  
	- 'make window visibility in all activities'  
	- It would also be nice to have 'make window exclusively visible in activity x' (maybe `Meta+Shift+Alt+<x>`)  this is the equivalent of 'move window to activity x'
	- Plus for ease keeping track of which activities a window is visible in the UI feature where the 'Show in activities' dialog pops up over the middle of the active window (when you hold `Meta+Shift` in my example).  So a keyboard shortcut for: "show 'Show in activities' for active window (while depressed)" 

This is more of a collection of feature requests to make a cohesive whole for a good experience quickly controlling window visibility in activities with the keyboard. 

A number of these are potentially slightly non-standard keyboard shortcuts as they may need to be aware that 'activity x' exists i.e. the shortcut for "move window to activity: 'x' " may need to be dynamically created when activity 'x' is created, though virtual desktops seem to get away with just having a bunch available even if they are not used so maybe that would work for activities too.

A keyboard shortcut which has the effect: "show 'Show in activities' for active window (while depressed)" Would also be useful for a 'hybrid' input mode where you use the keyboard to get the 'Show in activities' dialogue up and then click in the dialogue with the mouse as you can select windows of activities with the window and activity switchers (`Alt+Tab` & `Meta+Tab`). It still involves the mouse but has fewer steps than the `Alt+F3` approach.

It's quite a lot of stuff but I really think something like this is really needed to make activities viable for a more keyboard focused user.

[^1]: I know that you can do this with `Alt + F3` arrows keys space bar and return but in my experience this is quite flaky, the options are not changed when I try and toggle them with the spacebar and apply with return (at least on Plasma 5.25.5 on fedora 36 or 5.18.8 on ubuntu 20.04)