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Bug#910347: konsole: scaling factor causes tearing



Package: konsole
Version: 4:18.04.0-1
Severity: normal

Dear Maintainer,

   When I drag the cursor select texts on the screen, the border of the
   line gets randomly teared. Please see the screenshot, notice that 
   the bright lines are just my wallpaper leaked from the konsole
   background.
   
   I have scaling enabled as my laptop has a small screen, which means
   that `QT_SCREEN_SCALE_FACTORS` is set to `eDP-1=1.5;DP-1=1.5;HDMI-1=1.5;
   DP-2=1.5;HDMI-2=1.5;` The tearing no longer occurs if I unset the 
   scaling factor, but then it's just too small to read on a small
   screen.


-- System Information:
Debian Release: buster/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.18.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=zh_CN.UTF-8, LC_CTYPE=zh_CN.UTF-8 (charmap=UTF-8), LANGUAGE=zh_CN:zh (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages konsole depends on:
ii  kio                   5.49.0-1
ii  konsole-kpart         4:18.04.0-1
ii  libc6                 2.27-6
ii  libkf5completion5     5.49.0-1
ii  libkf5configcore5     5.49.0-1
ii  libkf5configgui5      5.49.0-1
ii  libkf5configwidgets5  5.49.0-1
ii  libkf5coreaddons5     5.49.0-1
ii  libkf5crash5          5.49.0-1
ii  libkf5dbusaddons5     5.49.0-1
ii  libkf5globalaccel5    5.49.0-1
ii  libkf5i18n5           5.49.0-1
ii  libkf5iconthemes5     5.49.0-1
ii  libkf5kiowidgets5     5.49.0-1
ii  libkf5notifyconfig5   5.49.0-1
ii  libkf5widgetsaddons5  5.49.0-1
ii  libkf5windowsystem5   5.49.0-1
ii  libkf5xmlgui5         5.49.0-1
ii  libqt5core5a          5.11.1+dfsg-9
ii  libqt5gui5            5.11.1+dfsg-9
ii  libqt5widgets5        5.11.1+dfsg-9
ii  libstdc++6            8.2.0-7

konsole recommends no packages.

konsole suggests no packages.

-- no debconf information

Attachment: konsole_1.png
Description: PNG image

Attachment: konsole_0.png
Description: PNG image


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