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[Chris Mayo <2007177@xxxxxxxxxxxxxxxxxx>]

I compiled a debug build and added more messages. When the fast preview
window is opened for the second time GLViewer::Redraw() is getting
called multiple times, and hanging at SwapBuffers().

I tried testing the glFlush() above for an error, removing it (a report
that SwapBuffers() does it anyway), replacing it with glFinish(). None
fixed the problem.

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https://bugs.launchpad.net/bugs/2007177

Title:
  Hugin freezes after opening Fast Panorama Preview for a second time

Status in Hugin:
  New

Bug description:
  1. Open Hugin in expert mode
  2. Load a project
  3. Open Fast Panorama Preview
  4. Close Fast Panorama Preview with the window close button (cross)
  5. Open Fast Panorama Preview
  6. Hugin freezes and GNOME says "Hugin Panorama Creator" is not responding
     and offers to force quit

  Hugin 2022.0.0
  GLEW 2.2.0 compiled with SYSTEM=linux-egl
  wxGTK 3.2.1 with Wayland support
  GTK 3.24.36
  GNOME 43, Wayland
  Gentoo Linux

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