https://bugs.kde.org/show_bug.cgi?id=351399

Martin Gräßlin <mgraess...@kde.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|1.0                         |---
            Product|plasmashell                 |kwin
           Assignee|aleix...@kde.org            |kwin-bugs-n...@kde.org
             Status|UNCONFIRMED                 |RESOLVED
            Version|master                      |5.7.0
         Resolution|---                         |INVALID
          Component|Multi-screen support        |xrandr

--- Comment #2 from Martin Gräßlin <mgraess...@kde.org> ---
Sorry for the late response.

> App window sometimes displays on the primary monitor, sometimes on the 
> extended monitor

This is something we do not really control. Windows have the possibility to
position themselves when they show. They indicate this through window hints to
the window manager and KWin (Plasma's window manager) honors this request. See
https://tronche.com/gui/x/icccm/sec-4.html#s-4.1.2.3 for more information. If
KWin sees a window with a position set it assumes that the window has more
information about where to go than the window manager. Apparently this seems to
be wrong in some cases. I appreciate any information about windows which show
this behavior.

For windows showing incorrect behavior you can override this with a window
specific rule to ignore the requested position. With that KWin places the
window and for that follows the "active screen" - that's to KWin either the
window with the currently active window or the screen containing the mouse
cursor (depending on config option).

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