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New option and minor fixes for animated GIF export

Know Zero requested to merge knowzero/krita:knowzero/animation-export-extra-options into master

This patch includes the following:

  • Option to toggle reserving a color for GIF transparency
  • Warn about transparency not working if user has an old FFMpeg version and trying to export a GIF
  • Cleanup the palette files after rendering is done
  • Fixed an error with exporting in single palette per frame option
  • Displays the FFMpeg version user selects

Test Plan

  1. Create an animation with a transparent background and then Render Animation
  2. Select GIF and FFMpeg version that is below 4.2, the version should show up alongside a warning about transparency not working
  3. Now select a version of FFMpeg that is 4.2 or above, the warning should vanish
  4. Click the options and select Per Single Frame under palette, then render the animation
  5. Check the output location, the gif should have been rendered with no transparency and no palette pngs should be left behind

Formalities Checklist

  • I confirmed this builds.
  • I confirmed Krita ran and the relevant functions work.
  • I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!)
  • I made sure my commits build individually and have good descriptions as per KDE guidelines.
  • I made sure my code conforms to the standards set in the HACKING file.
  • I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.
Edited by Know Zero

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