1277251 - Caret & text displaying twice on jsfiddle.net

Status: RESOLVED DUPLICATE of bug 1276467

(Core :: DOM: Core & HTML, defect)

Description

[Adam Stevenson [:adamopenweb]]

Attachment: jsfiddle.jpg

Steps to Reproduce
0) Open Nightly(49) or Dev edition with multi-process enabled
1) Navigate to: https://jsfiddle.net
2) Click the HTML section
3) Start typing

Expected Behavior:
One copy of the text appears

Actual Behavior:
Two copies of the text appear

Opening in a non-e10s window, the bug reproduces.
Disabling multi-process, the bug does not reproduce.

Originally reported on webcompat.com - https://webcompat.com/issues/2647

Comment 1

[Alice0775 White]

[Tracking Requested - why for this release]: Layout problem

Regression window:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=cc9051869d1a9078a821da5d1639299f9e836e0e&tochange=1ee604ae873ffae665e745b3553fb1c406dbdd6a

Regressed by:
1ee604ae873f	Matt Woodrow — Bug 1265237 - Clear clipping for out-of-flow frames that we are descending into but haven't stored explicit clip data for. r=mstange

Comment 2

[Marcia Knous [:marcia]]

Let's track this web compat issue for 48 and 49.

Comment 3

[Markus Stange [:mstange]]

Attachment: testcase

This only happens while the caret is visible. So somehow this is related to NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO.

Comment 4

[Markus Stange [:mstange]]

Timothy, any ideas?

Comment 5

[Markus Stange [:mstange]]

Good thing I wasn't CC'd on bug 1276467 and tnikkel wasn't CC'd on this bug. :-)

Comment 6

[Marcia Knous [:marcia]]

We'll track this for 48/49 in the duplicate bug.

Comment 8

[Daniel Holbert [:dholbert]]

This bug is not e10s-specific -- I see it in profiles with e10s disabled as well as enabled.  My screencast on duplicate bug 1280433 was recorded in a profile that had e10s disabled, for example.

--> Dropping [e10s] label from bug summary. Others, feel free to chime in if you get significantly-different results.

Comment 9

[Adam Stevenson [:adamopenweb]]

Thanks Daniel. Testing in Win 10 and Ubuntu I get the same results as you. In OSX when multi-process is disabled in the preferences menu, the issue doesn't reproduce. Which is what led me to think it was e10s related. I tested in both nightly and dev edition. Why do you think there's a difference?

Comment 10

[Daniel Holbert [:dholbert]]

(In reply to Adam Stevenson from comment #9)
> Thanks Daniel. Testing in Win 10 and Ubuntu I get the same results as you.

(Just to clarify - I think you're saying you can reproduce on these platforms, regardless of whether e10s is disabled -- correct?)

> In OSX when multi-process is disabled in the preferences menu, the issue
> doesn't reproduce. Which is what led me to think it was e10s related. [...]
> Why do you think there's a difference?

Not sure! I guess some quirk of our Mac graphics backend must save us by accident, when e10s is disabled.

Comment 11

[Adam Stevenson [:adamopenweb]]

Yes, I can reproduce in Win10 and Ubuntu with e10s disabled.

Comment 12

[Liz Henry (:lizzard)]

Tracking in the original bug.