** Tags added: dirty redraw region

** Description changed:

- Steps to reproduce:
+ [Impact]
  
+ Resizing windows in spread doesn't properly damage the screen
+ 
+ [Test case]
  1. Run Update Manager
  2. Start applying updates
  3. Hit Super + W
  4. Wait
  
  As the status window continually resizes itself during the update, it
  will leave behind old pixels, and your screen will look similar to the
  attached png.
  
- Some other keywords: dirty region redraw
+ [Regression potential]
+ 
+ Spread decorations could be redrawn more often during scale, thus
+ causing more computation.

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https://bugs.launchpad.net/bugs/940470

Title:
  Windows that resize themselves while in windows are spread (Super + W)
  leave old pixels behind

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