1285123 - caret bar blinks with an odd shift, sometimes even with a weird text shadow

Status: RESOLVED DUPLICATE of bug 1276467

(Core :: Layout, defect)

Description

[Jeremy Chen ([e-mail])]

Attachment: screenshot_blink_with_shadow_text

STR:
1. browse https://jsfiddle.net/
2. change focus to any content-editable sub window (HTML, CSS, JavaScript)
3. type few characters

Expect:
Caret bar always blinks at the same position.

Actual:
Caret bar blinks w/ a shift and a shadow text.
If you change focus to other window then go back, the shadow text may disappear but the shift still stands.

I can reproduce this on Aurora and Nightly, but not on Release.
If you verify this on Nightly, the shadow text would appear even w/o waiting.

Comment 1

[Ting-Yu Lin [:TYLin] (PST, UTC-7)]

Attachment: mozreview-comment-area.png

I saw a gray area besides the blinking caret on comment area on mozreview. Not sure if this is the same issue.

Comment 2

[Ting-Yu Lin [:TYLin] (PST, UTC-7)]

The image in Comment 1 was reproduce on Aurora 49.0a2 (2016-07-06)

Comment 3

[Morris Tseng [:mtseng] [:Morris] (Inactive)]

I did the regression check. Info as follow.

20:12.67 INFO: Last good revision: cc9051869d1a9078a821da5d1639299f9e836e0e
20:12.67 INFO: First bad revision: 1ee604ae873ffae665e745b3553fb1c406dbdd6a
20:12.67 INFO: Pushlog:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=cc9051869d1a9078a821da5d1639299f9e836e0e&tochange=1ee604ae873ffae665e745b3553fb1c406dbdd6a

20:13.92 INFO: Looks like the following bug has the changes which introduced the regression:
https://bugzilla.mozilla.org/show_bug.cgi?id=1265237

Comment 4

[Morris Tseng [:mtseng] [:Morris] (Inactive)]

Matt, do you have any idea here?

Comment 5

[Morris Tseng [:mtseng] [:Morris] (Inactive)]

Looks like dup of bug 1276467

Comment 6

[Liz Henry (:lizzard)]

Just tweaking the flags here so that this won't show anymore in Platform triage. This is tracked in the original bug for 48+.