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Able to paint "through" disabled UI items.
Open, Confirmed, MediumPublic


Blender Version
Broken: 2.80, 2.81...

Short description of error
With region overlap, if a UI element is diabled, clicks are passed through it, which can result in paint strokes.

Exact steps for others to reproduce the error

  1. Load the default scene and enter Texture Paint mode on the cube.
  2. Add a paint slot and make a stroke.
  3. In the UV/Image editor, select the painted image, open the sidebar and switch to Image tab. The UI items should be disabled there now.
  4. Make sure that sidebar overlaps the image.
  5. Click on sidebar background.
  6. Click on any of the disabled items.

In (5), nothing happens. In (6), the click passes through and leaves a paint stroke on the image.