Make debug windows right edge sticky

[GrayHatter]

Now when the right edge of any debug window in the list is at the edge of the viewport width, it will stick there through resizes.

There's a bug where if the resize change is enough to "capture" a window that wasn't intended to be sticky it will capture. Given this didn't happen much during testing, I don't think the extra state + code required is worth it for these windows.

[codecov[bot]]

Codecov Report

Base: 86.71% // Head: 86.71% // No change to project coverage :thumbsup:

Coverage data is based on head (2165393) compared to base (159409e). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #455   +/-   ##
=======================================
  Coverage   86.71%   86.71%           
=======================================
  Files          83       83           
  Lines        3981     3981           
=======================================
  Hits         3452     3452           
  Misses        529      529           

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