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[Alessandro Astone <2107245@xxxxxxxxxxxxxxxxxx>]

** Information type changed from Public Security to Public

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https://bugs.launchpad.net/bugs/2107245

Title:
  Resizing XWayland & X11 windows is extremely slow

Status in GTK+:
  Fix Released
Status in Mutter:
  New
Status in gtk4 package in Ubuntu:
  Fix Committed
Status in mutter package in Ubuntu:
  Opinion
Status in gtk4 source package in Plucky:
  In Progress
Status in mutter source package in Plucky:
  Opinion
Status in gtk4 source package in Questing:
  Fix Committed
Status in mutter source package in Questing:
  Opinion

Bug description:
  [ Impact ]

  When resizing X11 windows that use server-size-decorations on Xorg or
  through XWayland (Discord, Spotify, etc) the resize does not take
  effect until seconds after holding the resize. If you let go of the
  resize before it happens then window does not resize at all.

  [ Test Plan A ]

  1. Enable fractional scaling and set a scaling factor of 125% or 150%
  2. Log into an Ubuntu Desktop Wayland session
  3. Start Spotify
  4. Try to resize the window
  5. Verify that the window can be resized normally

  [ Test Plan B ]

  1. Enable fractional scaling and set a scaling factor of 125% or 150%
  2. Log into an Ubuntu Desktop Xorg session
  3. Start Spotify
  4. Try to resize the window
  5. Verify that the window can be resized normally

  [ Where problems could occur ]

  This update is included in the 4.18.5 bugfix release from upstream.
  See bug 2109964

  [ Other info ]

  The issue was originally reported on NVIDIA hardware:
  """
  Ubuntu 25.04 Beta
  NVIDIA RTX 5090 (570.133.07)
  """
  but it can be reproduced on any graphics driver.

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