[cinnamon/windowManager] PERF: Batch workspace-switch animations

[carsteneu]

Prevent compositor "overload" when switching workspaces with many windows.

• Added animation queue with MAX_CONCURRENT_ANIMATIONS = 10 limit
• Process animations in batches instead of starting all simultaneously
• Each completed animation triggers the next from queue

Without batching, 100+ windows create 100+ parallel Clutter timelines, causing frame drops and compositor stutter.

I had this problem because I often have more than 100 windows open across 12 workspaces. (Really? Yes, really.)

With the fix, switching between workspaces is noticeably faster and smoother.

Cheers, Carsten

[mtwebster]

Your use-case is exceptional - let's just skip the animation if there are more than so many windows open. I don't like this added complexity here. This won't ever be an issue for most users.

[carsteneu]

Thats true, not so special if you think about 10 or 20, but it is also more snappy if there are only a few windows on standard 4 workspaces. I think it will also count on older hardware.

[mtwebster]

I don't like the added complexity, or the effect you get with this - it's distracting to change workspaces and then have to wait extra time for the overflow to catch up.

Again I think the best answer here is to skip the animation in extreme situations - get the window list immediately in _switchWorkspace and add a length check to the early return for skipping the animation. I think the max could be increased to at least 20 also.