With each relaunch of the Editor, the Main Frame Window grows by 10x10 pixels.
The editor viewport, in turn, grows by a few pixels in response to that.

See attached three images: Window1, Window2, Window3 Each window was screen captured at 100% with Snatch-it showing a progression of 10 pixels larger in diameter each time the editor was opened.

Not a regression: Occurs in UE4.14.3

Steps to Reproduce
  1. Open a new blank project in UE4.15
  2. Resize Main Window so that it is a floating Window
  3. Take a snapshot with Snag-it or similar software
  4. Close the Editor making sure keep layout is selected
  5. Open project again
    RESULT: The main window is now 10 pixels greater in diameter
    EXPECTED: The main window to remain the same size each time the editor is opened

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Affects Versions4.14.34.15
Target Fix4.17
Fix Commit3405382
Main Commit3432852
CreatedFeb 17, 2017
ResolvedApr 24, 2017
UpdatedApr 27, 2018