Remove flicker from rotation and zoom notices

Carsten Hartenfelsrequested to merge
hartenfels/krita:feature/noticeflicker into master

The rotation notice now no longer jitters between -0.0 and 0.0, instead always showing the latter in case of a zero-ish rotation.

When using e.g. a two-finger gesture to both zoom and rotate simultaneously, the messages now combine into a single notice instead of flickering back and forth between each other.

Test Plan

  • Make a slight canvas rotation that doesn't exceed the snapping around zero degrees. Observe that the rotation popup notice stays on 0.0 instead of jittering between -0.0 and 0.0.
  • Use a canvas input that both zooms and rotates simultaneously. Observe that the popup message shows both.
  • Zoom and rotate the canvas distinctly. Observe that you still only get a single message unless you do it within half a second of each other.

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.
  • Does the patch add a user-visible feature? If yes, is there a documentation MR ready for it at Krita Documentation Repository?

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