https://bugs.kde.org/show_bug.cgi?id=452447

            Bug ID: 452447
           Summary: [wish] Grouping windows of same applications more
                    tightly in Overview.
           Product: kwin
           Version: unspecified
          Platform: Other
                OS: Other
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: effects-overview
          Assignee: kwin-bugs-n...@kde.org
          Reporter: shenlebantongy...@gmail.com
  Target Milestone: ---

SUMMARY

Grouping related windows more tightly or side by side (maybe partially
overlapping).

Some users can easily get 10+ windows opened due to some applications requiring
more than one window (like multiple instances of Firefox, LibreOffice, mail
reader, emacs). The overview will come unusable due to all windows rearranged
into scatters.

I didn't look at the algorithm for overview window aligning/ordering, but I do
think windows from the same application should be aligned side by side or
grouped together, like the grouping in the taskbar.

Think about this: With the grouped windows in the overview, a user wants a
firefox instance for academic research, he toggles the overview, and just scans
around the "firefox group" to select the "academic" firefox window. Easy
breezy!

STEP TO REPRODUCE

1. open multiple windows of Firefox, LibreOffice, Emacs frames or Konsoles.
2. toggle overview
3. All applications windows are mixed together, and hard to select one unless
eye scan one by one.

PRIOR ARTS

macOS -> see screenshot. I believe it is one of the elegant designs. (macOS
native apps tend to be a single instance and using tabs for different
"documents", overlap-grouping works for them)

GNOME -> Since GTK4, all top native GTK4 applications can only have a single
top-level window, and all subwindows are just surface floating on top of it,
thus they will be grouped together automatically. I cannot do the test, but I
don't think they have special handling for none-GTK apps.

Windows -> Same as KDE right now, windows of same applications scattered
around.

ADDITIONAL INFORMATION

1. open GIMP
2. unselect "Windows -> single-window mode", the overview will be somehow
strange.
3. The GIMP docks are scattered and mixed with other windows in the overview.

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