[Bug 1929790] Re: Request to backport fix for endianness issue in TigerVNC vncviewer

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Title:
  Request to backport fix for endianness issue in TigerVNC vncviewer

Status in Ubuntu on IBM z Systems:
  New
Status in tigervnc package in Ubuntu:
  New

Bug description:
  ---Problem Description---
  TigerVNC 1.11.0 contains a regression that causes vncviewer to display
  incorrect colors when vncviewer and X11 server use different endianness (e.g.,
  when using X11 forwarding via SSH between an x86-64 desktop and a Linux system
  on s390x). The regression was originally reported in github issue
  https://github.com/TigerVNC/tigervnc/issues/1073 and fixed in github pull
  request https://github.com/TigerVNC/tigervnc/pull/1084

  The regression caused vncviewer to always use the system byte order for pixel
  values instead of the byte order required by the X11 display. With the fix,
  vncviewer queries the X11 display for the required byte order.

  As of now, the fix has not made it into a release yet. Please consider
  backporting the fix (upstream commit 7ab92639848). I confirmed that this commit
  cleanly applies on top of release 1.11.0 and fixes the regression.

  ---uname output---
  Linux s390x
   
  Machine Type = x15 
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   See also https://github.com/TigerVNC/tigervnc/issues/1252

  
  - From a Linux x86 system, connect to a Linux system on s390x via SSH with X forwarding
  - Start a Xvnc session on that Linux system

  tigervncserver :0 -geometry 800x600 -depth 32

  - Start vncviewer on the same Linux system

  xtigervncviewer :0

  - On vncviewer's window on your origin X session, observe incorrect colors.
  - Optionally, start X11 programs such as xlogo, xclock, or xeyes to make the problem obvious
  - Optionally, connect to the vnc session directly (i.e., with a vnc client on the origin system) to compare

   
  Userspace tool common name: vncviewer 
   
  The userspace tool has the following bit modes: 64-bit 

  Userspace rpm: tigervnc-viewer

  Userspace tool obtained from project website:  na

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