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[bmarsh <2077979@xxxxxxxxxxxxxxxxxx>]

Another work around for this problem is to just expand or contract the
window using mouse.  Waveform pops right back.

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https://bugs.launchpad.net/bugs/2077979

Title:
  Audacity 3.6.0/3.6.1: Waveform screen goes blank when zooming

Status in audacity package in Ubuntu:
  Incomplete

Bug description:
  As reported in https://github.com/audacity/audacity/issues/7108 by
  someone else, but fully reproducible with the oracular build of 3.6.1,
  the interface waveform render goes blank after a bit of zooming.

  This is an upstream bug fixed in
  https://github.com/audacity/audacity/pull/6955 , merged in the
  upcoming 3.6.2 release.

  I've tested building oracular's 3.6.1 adding just commit bf7b2dd (i.e.
  https://github.com/audacity/audacity/commit/bf7b2dd95756f6077790ff8d4eb3306833203fa4.patch
  ) and can confirm it fully fixes this bug.

  The only reliable workaround I've found is to force the Audacity
  interface to fully re-render by accessing the Edit -> Preferences
  dialog, not changing anything, and closing it via the Ok button (as
  opposed to the Cancel button.) That of course doesn't prevent the
  problem from manifesting again after a few zoom operations, but it's
  better than nothing. Quite annoying though.

  Not aware of the release plans for oracular, but if there are no plans
  to ship 3.6.2, then that patch should probably be added in, since this
  bug is disruptive.

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