Search Field within Blueprint Graphs lose focus after Right-Clicking on Mac and Linux

The search field within blueprints loses focus after right-clicking in an empty space in the graphs.

I checked to make sure this was not a universal issue, and it is indeed platform specific with the Mac. I added two components since it deals with Blueprints specifically, but it is tied to the Mac.

EDIT:
This occurs on Linux as well with the same repro steps.

Regression?
Yes. Issue did not occur in 4.10.4, where you could immediately begin typing in the search field after right-clicking.

1. On a Mac, open up the Event Graph for any Actor Blueprint.
2. Right-click in a blank space to bring up search menu utility.
3. Attempt to start typing without clicking the search field with the mouse.

Outcome You are not able to immediately begin typing after right-clicking, and must click in the empty search field in order to search.

Expected You can immediately begin searching by typing on the keyboard after right-clicking.

Tested and reproduced issue 3/3 times.