1274719 - When narrowing a textarea, its border-right is repainted intermittently, creating a residual painting trace

Status: RESOLVED WORKSFORME

(Core :: Layout: Form Controls, defect)

Description

[Gérard Talbot]

Tests
-----

http://test.csswg.org/suites/css-writing-modes-3_dev/nightly-unstable/html/form-controls-vrl-005.htm

http://test.csswg.org/suites/css-writing-modes-3_dev/nightly-unstable/html/form-controls-vlr-005.htm

http://test.csswg.org/suites/css-writing-modes-3_dev/nightly-unstable/html/form-controls-srl-005.htm


Step
----

Make the <textarea> as wide as you can and then narrow it down slowly: try to horizontally-only narrow it down.


Actual
------

The right border of the <textarea> gets repainted intermittently, creating a residual painting trace


Expected
--------

The right border of the <textarea> should not be repainted intermittently, therefore it should not create a residual painting trace


Explanation
-----------

This layout issue can be reproduced in tests with 'writing-mode: horizontal-tb'. 
Other form controls can be affected by a resizing <textarea>; <input type="text"> can also start painting its left or right border intermittently as/if its horizontal position changes, moves leftwardedly (from right toward left)


Notes
-----

- Severity set to minor
- this spun from bug 1272997 comment 3 and bug 1272997 comment 5
- Another test with 'writing-mode: horizontal-tb' is coming up
- I am using Firefox 49.0a1 buildID=20160520030251
- I use Linux 3.13.0-86-generic x86_64, Qt: 4.8.6, KDE 4.13.3; Kubuntu (trusty) 14.04.4 LTS
- I've searched for duplicates and did not find any.

Comment 1

[Gérard Talbot]

Additional test:

http://www.gtalbot.org/BugzillaSection/Bug1274719-narrowing-textarea.html

Comment 2

[Gérard Talbot]

I do not know for sure if this bug affects Windows and/or Mac OS X. So, I'm marking this Linux-only for now.

Comment 3

[Gérard Talbot]

Firefox 46.0.1 buildID=20160511224433 and Firefox 48.0a1 buildID=20160401175617 (both under Linux) also render actual results.

Screenshots available if requested.

Comment 4

[Gérard Talbot]

I no longer can reproduce the issue, the actual results in all 3 tests.

I am using Firefox 115.6.0 ESR buildID=20231211164624 under Linux Debian 12.4, KDE Plasma version 5.27.5 with KDE Framework version 5.103.0.

Resolving as WORKSFORME