Issue 471126 in chromium: text-combine: background rectangle and selection problem

[chro...@googlecode.com]

Status: Unconfirmed
Owner: ----
Labels: Pri-2 Via-Wizard Type-Compat OS-Windows

New issue 471126 by hro.sug...@gmail.com: text-combine: background
rectangle and selection problem
https://code.google.com/p/chromium/issues/detail?id=471126

UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:36.0) Gecko/20100101
Firefox/36.0

Example URL:

Steps to reproduce the problem:
1. pls load attached text-combine-selection-bg.html
2.
3.

What is the expected behavior?
{selection, background} rectangle of text-combined element should be
rendered properly.

What went wrong?
1) invalid background rectangle for text-combined glyphs.
(too large, too narrow, bad position : depending on font metrics?).

2) selection hilite for emphasis mark of text-combined glyph is not
rendered.

3) selection hilite rectangle for text-combind glyphs is different with
background rectangle of it.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? N/A

Did this work before? N/A

Does this work in other browsers? N/A

Chrome version: 43.0.2346.0 (Official Build) canary （32 ビット） Channel:
canary
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 17.0 r0

Attachments:
text-combine-selection-bg.html 1.8 KB
text-combine-selection-bg.png 125 KB

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[chro...@googlecode.com]

Updates:
Status: Assigned
Owner: ko...@chromium.org
Cc: ranjit...@chromium.org
Labels: -Pri-2 -Type-Compat -OS-Windows Pri-1 Type-Bug-Regression OS-All
M-42

Comment #2 on issue 471126 by ranjit...@chromium.org: text-combine:

background rectangle and selection problem
https://code.google.com/p/chromium/issues/detail?id=471126

Able to reproduce the issue on chrome version 43.0.2351.3 dev. It is a
regression broken in M42 on Windows, MAC and Ubuntu. Please find the bisect
details below:

Change Log:
https://chromium.googlesource.com/chromium/src/+/82feb714b91b89685aacbbc8f49f6dc4145b0a4b

Blink Log:
https://chromium.googlesource.com/chromium/src/+log/8787ad84e79b909f951bdca491ab1ef48a7ead3c..82feb714b91b89685aacbbc8f49f6dc4145b0a4b

Suspecting Blink change: 189382, @kojii: could you please check if this is
caused with respect to your change, if not could you please help us in
reassigning the issue to the right owner

Review URL: https://codereview.chromium.org/799123003

[chro...@googlecode.com]

Updates:
Labels: -Pri-1 -Type-Bug-Regression Pri-2 Type-Bug
Cr-Blink-Layout-WritingMode

Comment #3 on issue 471126 by ko...@chromium.org: text-combine: background

rectangle and selection problem
https://code.google.com/p/chromium/issues/detail?id=471126

I'll take a look, but this is not a regression. M42 changed the behavior to
be more conformant to the spec, 1 is probably a bug in the new behavior, 2
and 3 are a lack of implementation. Changed labels accordingly.

[chro...@googlecode.com]

Comment #4 on issue 471126 by ko...@chromium.org: text-combine: background

rectangle and selection problem
https://code.google.com/p/chromium/issues/detail?id=471126

1. "Too large" is a bug when a text-combine has break opportunities. It
affects not only background but also layout of the following text.
2. "Too narrow" is by design. When it has to shrink by scaling, it
overflows slightly to mitigate the readability.
3. "Bad position" is caused by Meiryo's metric. It occurs only with Meiryo,
so it should be in a separate bug.
4. Selection rendering used to be worse, it was improved in bug 438852.
Supporting selection gaps and emphasis marks should also be in a separate
bug.