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[Norbert <1906138@xxxxxxxxxxxxxxxxxx>]

** Also affects: qtbase-opensource-src (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: mate-themes (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1906138

Title:
  Indeterminate Qt progress bars don't display properly in 20.04

Status in Ubuntu MATE:
  New
Status in mate-themes package in Ubuntu:
  New
Status in qtbase-opensource-src package in Ubuntu:
  New

Bug description:
  In Ubuntu MATE 20.04, a Qt program with an indeterminate progress bar
  (meaning its minimum and maximum values have both been set to zero)
  does not display properly. It is supposed to animate in a way that
  shows that something is happening with an unknown time remaining.
  Instead, it sits still with its progress bar showing approximately 25
  to 30% progress.

  To test this, make a simple Qt program with a QProgressBar in the main
  window, and add these lines to the constructor of the main window:

  ui->progressBar->setMinimum(0);
  ui->progressBar->setMaximum(0);

  This problem is not present in standard Ubuntu 20.04. Standard Ubuntu
  correctly animates the indeterminate progress bar. It's unclear to me
  which package is at fault, but it seems to be something specific to
  Ubuntu MATE because standard Ubuntu 20.04 doesn't have this problem.

  Ubuntu MATE 18.04 also has this problem with Qt 5. With Qt 4 it
  doesn't have this problem.

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