Canceling the Color Picker while modifying Curve Editor colors Moves Transforms Curves

If the user presses 'Cancel' when modifying colors using the Color Picker within the Curve Editor, the curves points are all transformed.
Issue is reproducible in the below engine versions:

4.8.3 - 2634408
4.9.2 - 2707645
4.11.0 - 2712527

1. Create a new blank 4.9.2 blueprint project.
2. Enable the 'Show Engine Content' option within the content browser.
3. Open the 'C_Sky_Horizon_Color' Color Curve.
4. Double click on one of the color/gradient handles at the bottom of the curve editor to open the Color Picker.
5. Press 'Cancel'

Outcome - Points along the curves drop to a very low point on the graph and almost seem to stack upon one another.

Expected - Cancel will close the Color Picker and nothing happens.

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