1636747 - Whitespace unexpectedly disappears when typing in contenteditable

Status: RESOLVED FIXED

(Core :: DOM: Editor, defect, P1)

Description

[Kagami Rosylight [:saschanaz] (they/them) (OOO until Dec 11)]

1. Open https://www-archive.mozilla.org/editor/midasdemo/
2. Type "뮤 뮤 뮤 뮤 뮤 뮤" ("ab ab ab ab ab ab" in QWERTY)

Expected: "뮤 뮤 뮤 뮤 뮤 뮤"
Actual: "뮤뮤 뮤뮤 뮤뮤"

This is a quite recent regression but I can't bisect as somehow builds from mozregression can't repro this. It only happens on public Nightly releases and local debug builds.

Comment 1

[Kagami Rosylight [:saschanaz] (they/them) (OOO until Dec 11)]

This severely degrades editing experience on most websites with contenteditable and can be reproduced consistently on my two devices with/without fission.

Mozregression says it's a regression by Bug 503838.

Comment 3

[Emilio Cobos Álvarez (:emilio)]

A smaller test could be:

• Open https://www-archive.mozilla.org/editor/midasdemo/
• Type "aaa aaa"
• Ctrl + Backspace
• Type "a"

Expected:

• "aaa a"

Actual:

• "aaaa"

Comment 4

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

The patches for this bug become too bigger than the regressed patch. I'll post a backout patch instead.

Comment 5

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

Attachment: Bug 1636747 - Backout the 1st patch of bug 503838 r=m_kato!

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/mozilla-central/rev/c04989a22240
Backout the 1st patch of bug 503838 r=m_kato

Comment 7

[Natalia Csoregi [:nataliaCs]]

https://hg.mozilla.org/mozilla-central/rev/c04989a22240