[kwin] [Bug 418229] Moving window between laptop screen and external monitor changes font sizes in strange ways

[Achim Bohnet]

https://bugs.kde.org/show_bug.cgi?id=418229

Achim Bohnet <ach at mpe.mpg.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|dolphin                     |kwin
            Version|19.12.2                     |5.18.1
          Component|general                     |xrandr
           Assignee|dolphin-bugs-null at kde.org   |kwin-bugs-null at kde.org

--- Comment #11 from Achim Bohnet <ach at mpe.mpg.de> ---
I can now reprocude the problem.

 * Booting with USB-C dock connected -> good.  No weird fonts size changes. See
Attachments xrandr.boot-with-dock

 * Booting without USB-C dock connected or unplug & plugin ->  Bad. Weird fonts
size changes. See attachments xrandr.boot-without-dock*

Looking at the differences in xrandr shows, that for the working cases the
xrandr output is DP-n.
for the weird fonts size change the output DP-n-m.

So the 'cascading'(?) of DP-n-m seems to cause problems:

(0)ach at it01lt:~$ diff -u xrandr.boot-with-dock2.lis
xrandr.boot-with-dockunplug_plug.lis
--- xrandr.boot-with-dock2.lis  2020-03-06 13:57:20.315337354 +0100
+++ xrandr.boot-with-dockunplug_plug.lis        2020-03-06 13:52:12.876124811
+0100
@@ -57,7 +57,10 @@
 HDMI-1 disconnected (normal left inverted right x axis y axis)
 DP-2 disconnected (normal left inverted right x axis y axis)
 DP-3 disconnected (normal left inverted right x axis y axis)
-DP-4 connected 3840x2160+2560+0 (normal left inverted right x axis y axis)
609mm x 349mm
+DP-4 disconnected (normal left inverted right x axis y axis)
+DP-5 disconnected (normal left inverted right x axis y axis)
+DP-2-1 disconnected (normal left inverted right x axis y axis)
+DP-2-2 connected 3840x2160+2560+0 (normal left inverted right x axis y axis)
609mm x 349mm
    3840x2160     60.00*+  60.00    29.98  
    2560x1440     59.95  
    2048x1280     59.99  
@@ -75,4 +78,4 @@
    720x480       60.00    59.94  
    640x480       75.00    60.00    59.94  
    720x400       70.08  
-DP-5 disconnected (normal left inverted right x axis y axis)
+DP-6 disconnected (normal left inverted right x axis y axis)
(1)ach at it01lt:~$ diff -u xrandr.boot-with-dock2.lis
xrandr.boot-with-dockunplug_plug.lis

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