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Crash when clicking Gradient Map/Palettize filter

Sharaf Zaman requested to merge szaman/krita:bug-430802-crash-scrolling into master

This only happens with these two items because they both create a QScroller which when used while Kinetic Scrolling is enabled, is pushed to a m_recognizers container. But when we delete the widget, the cached value which was next to scroller's recognizer (a coincidence probably) is taken to be valid hence a crash.

Test Plan

I only tested the Qt build on Android.

BUG:430802

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.
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