356826 - A particular Unicode character is displayed incorrectly throughout all components, altering standard format significantly.

Status: RESOLVED DUPLICATE of bug 598900

(Core :: Layout: Text and Fonts, defect)

Description

[Gordon Edmands Myers]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7

The backwards-tilde ("∽"), which can be represented as HTML character code by ∽ does not display correctly in every context within Firefox, including, but not limited to, normal page output, View Source, Find, Search Bar, Address Bar, and input and textarea fields within a web form. In some cases where vertical space is limited, use of this character will effectively make all other characters invisible.

Reproducible: Always

Steps to Reproduce:
1. Use the ∽ character in any context on a Windows machine.
Actual Results:  
The character does not obey the normal line-height rules.

Expected Results:  
It should maintain the same line-height as all other characters.

Screenshot: http://img238.imageshack.us/img238/8338/utakatapw3.gif

Theme:
* iFox Smooth

Extensions:
* Firefox View 0.31.2
* IE View 1.3.1
* User Agent Switcher 0.6.9
* Html Validator 0.7.9.5
* ChatZilla 0.9.75
* Live HTTP Headers 0.12
* View Source in Tab 0.2.1
* DownThemAll! 0.9.9.7
* Blogger Web Comments 1.3
* Tamper Data 9.8.1
* IE Tab 1.1.1.4
* Tab Mix Plus 0.3.0.5
* Gmail Notifier 0.5.6.5
* Video Downloader 1.1.1
* SearchStatus 1.18
* Adblock v.5 d3 * nightly 43
* searchcache 2005.11.28
* Cache View 1.6

Comment 1

[Steve England [:stevee]]

Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7
Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8.1) Gecko/20061015 BonEcho/2.0 ID:2006101503

Doesn't look like the screenshot for me.

Comment 2

[Tyler Downer [He/Him]]

Will try to create testcase, though limited info makes this dificult.

Comment 3

[Tyler Downer [He/Him]]

Attachment: Testcase

Comment 4

[Tyler Downer [He/Him]]

This is confirmed on Windows XP running Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0. The upper example on the testcase has odd line spacing, while the lower one has the correct line, with no &#8765. 

This issues does not exist on Windows Vista with Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1a1pre) Gecko/2008071903 Minefield/3.1a1pre.

Comment 5

[Wayne Mery (:wsmwk)]

still fails

Comment 6

[Jonathan Kew [:jfkthame]]

This is the same issue as discussed in bug 598900 and its duplicates; see there for more details. In short, it's caused by the metrics of the fallback font that's found for the backwards-tilde character in this example.