1281477 - [Mac] Glitches while scrolling through hello conversations

Status: RESOLVED DUPLICATE of bug 1208437

(Core :: Layout, defect)

Description

[Bogdan Maris, Desktop Test Engineering]

[Affected versions]:
- Firefox 47.0
- Firefox 48 beta 2
- latest Developer Edition 49.0a2
- latest Nightly 50.0a1

[Affected platforms]:
- Mac OS X 10.10.5

[Unaffected platforms]:
- Mac OS X 10.11.2 
- Mac OS X 10.9.5

[Steps to reproduce]:
1. Start Firefox
2. Start a few hello conversations so the scrollbar appears inside hello panel
3. Scroll through conversations

[Expected result]:
- No visual defects can be seen

[Actual result]:
- Glitches are present in hello panel while scrolling

[Regression range]:
- This is not a regression, it reproduces on old nightly builds (36.0a1).
I did search for a regression range though but I get something that points to the implementation of rooms:

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=084441e904d1&tochange=b4fbeba78a7d

Bug 1099128 - Swap Loop to use rooms rather than call urls

So this bug has been there since forever.

[Additional notes]:
- Not quite sure if this is a hello bug of something graphics related. I also have a feeling I ran into this bug in my early days but could not find the specific bug (if there is any).
- Screencast showing the issue is attached.

Comment 1

[Bogdan Maris, Desktop Test Engineering]

(In reply to Bogdan Maris, QA [:bogdan_maris] from comment #0)
> - Screencast showing the issue is attached.

And here is the promised screencast: https://db.tt/8P1Qid6x (to large for uploading to bugzilla)

Comment 2

[Mark Banner (:standard8)]

All we're doing is using a browser that gets display in front of the main window. This feels like some platform type of bug - not correctly accounting for focus/scroll window.