Open Radar

 
Summary:
Hi!

I do completion-on-demand with the escape key.  If I don't filter the completions (say just want to scroll through them), the completion window is unscrollable, arrow navigation is nearly invisible, and clicking the scroll thumb dismisses the pop-over.


Please see movie at [bad-completion,mp4] [dropbox url redacted] (I can't upload because radarweb is unreliable with uploads > 5meg. c.f. rdar://30364703

Steps to Reproduce:
Start a completion, such as  `someObject. [escape]`

Expected Results:
Completion window pops up
I can scroll the completion window
I can easily arrow in the completion window, scrolling if I go off the bottom
I can click and drag the scroll thumb in the completion window

Observed Results:
Completion window pops up
The window doesn't scroll
Arrowing around selects the items in the visible region, but with such a washed-out color I couldn't tell what was going on
Clicking the scroll thumb dismisses the window.

Version:
Version 9.0 beta (9M136h)
10.12.5 (16F73)

Notes:
If I restrict the completion by typing some stuff, I get two overlapping completion windows - one with a little bit of stuff, one with everything behind the one with stuff, and the everything-behind is scrollable.

The video has text annotations of all of these observed cases.

Configuration:
Works fine in Xcode 8, same exact project.
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