When using Application Scale in the editor, using F11 to make the viewport fullscreen results in an either zoomed in or zoomed out fullscreen version.

Note: This same issue occurs when using a combination of UI scaling in windows 10 and "-enablehighdpi"

Regression?: No
This also occurred in 4.13

Steps to Reproduce
  1. Open a project
  2. Set the application scale to a value other than 1.0 (Window > Developer Tools > Widget Reflector > Application Scale at the top left)
  3. Click on the editor's viewport
  4. Press F11
    Result: The viewport becomes zoomed in (if scale is over 1.0) or zoomed out (if scale is under 1.0) and doesn't adhere to the screen correctly
    Expected: The viewport becomes fullscreen as expected

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Won't Fix
Affects Versions4.
CreatedJan 11, 2017
ResolvedAug 18, 2021
UpdatedAug 18, 2021
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