Łukasz, thank you very much for accepting the package into bionic-
proposed. I confirm that the updated binary package libqt5printsupport5
fixes the problem. I also updated other libqt5* packages available in
bionic-proposed, and did not notice any obvious regressions.

However, I would like to voice my differing opinion on the importance of
this bug. While this is perhaps not a high-impact bug in the meaning
that it does not impact system stability or security, it is nonetheless
one of the "infuriating little bugs" that significantly degrade user
experience. For the user who does not remember to dig into prefs to
change paper size before every print job, the bug results in the
necessity of printing everything twice, as the first copy (A4 on Letter)
has top and bottom lines clipped and missing, rendering the printout
unusable. This bug, coupled with similar ones and the general
instability of KDE desktop, makes Kubuntu 18.04 unsuitable as a desktop
OS for everyday use, in my opinion. Because of that I am very grateful
that this bug is getting fixed.

** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

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  Qt print dialog has wrong default page size

Status in qtbase-opensource-src package in Ubuntu:
  Fix Released
Status in qtbase-opensource-src source package in Bionic:
  Fix Committed

Bug description:
  Please backport Qt patch 213677 to qtbase-opensource-src

  In Qt5 applications, print dialog (Printer Properties) always defaults to A4 
paper size, even when Letter is set as a default in all system and KDE 
preferences. After changing manually, Letter-size pages print correctly, but 
the setting does not stick.

  This impacts users of Qt applications who print things and live in
  countries where ISO 216 is not default, most notably the United

  [Test Case]
  1) Use system settings (KDE preferences, gnome-control-center or 
system-config-printer) to set the printer size to Letter.
  2) Open any Qt application (e.g. KWrite or Falkon).
  3) Open a print dialog.
  4) Behavior expected: Print dialog would default to Letter paper size and not 

  [Regression Potential]
  Two possibilities for regressions that I can imagine are:
  - crashes because something is not defined;
  - wrong default paper size (A4 wanted but CUPS returns something else).

  [Additional Information]
  The issue also affects other print settings, e.g. margins, though the 
aforementioned patch does not deal with these. A similar issue regarding the 
duplex setting was reported as Launchpad bug 1776173, and subsequently fixed, 
but other print settings continue to cause problems.

  Software versions:
  lsb_release: Ubuntu 18.04.3 LTS
  libqt5core5a: 5.9.5+dfsg-0ubuntu2.3
  Kernel: 5.0.0-25-generic

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