When setting the DPI Scale Rule to custom and using a named slot the frame rate of the editor will drop while zooming in and out of a widget that uses the widget containing the named slot.

Steps to Reproduce
  1. Download the attached project
  2. Open the attached project
  3. Open the project settings
  4. Navigate to the DPI Scale Rule (project settings > User Interface > DPI Scale Rule)
  5. Set the DPI scale rule to "Custom"
  6. Press the '~' key and input the command "Stat FPS"
  7. Open the widget "FPSDrop"
  8. Separate the Window for the widget from the main editor (so that you can see the current frame rate as well as the widget designer tab)
  9. Click on "NamedSlot_59 (CanvasPanel_1)" in the widget hierarchy
  10. Zoom in and out of the designer tab (using the scroll wheel)

Result: The FPS will continue to drop as the zoom is adjusted
Expected: The Frame rate would remain relatively steady.

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ComponentUE - Editor - UI Systems
Affects Versions4.
Target Fix4.22
Fix Commit4724090
Main Commit4837001
Release Commit4862694
CreatedNov 19, 2018
ResolvedJan 15, 2019
UpdatedFeb 12, 2019
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