379017 - Unexpected BOM draws glyph box - should be treated as ZWNBSP

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[John P Baker]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9a4pre) Gecko/20070423 Minefield/3.0a4pre
Build Identifier: 

It is possible to get a glyph box containing FEFF if a document contains an unexpected BOM. The unicode standard expects this to be treated as a ZWNBSP so should probably be included in IsZeroWidthUnicodeChar.

Reproducible: Always

Steps to Reproduce:
1. Go to http://www.google.com/accounts/TOS
Actual Results:  
Glyph box in top left hand corner


There may be more than one bug here as it was very difficult to produce a test case; But if BOM gets to the the display functions it should probably be treated as IsZeroWidthUnicodeChar

Comment 1

[John P Baker]

Attachment: testcase (provided it uploads as utf8)

Comment 2

[Justin Kerk]

See also bug 205387.

Comment 3

[John P Baker]

Both the URL and the testcase now work for me - possibly the textrun changes