757521 - Missing hexboxes for some unprintable characters

Status: RESOLVED FIXED

(Core :: Graphics, defect)

Description

[Heffebaycay]

Attachment: firefox-chars.txt

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0
Build ID: 20120420145725

Steps to reproduce:

I opened the following file in Firefox: http://dl.dropbox.com/u/21565521/firefox-chars.txt (File attached to this report)

Basically this file contains the characters BEL (0x07) and SOH (0x01) right before and after the "%s1" placeholder


Actual results:

The text was shown, as expected, but some characters were missing.


Expected results:

Hexboxes should have been shown right before and after the "%s1" placeholder in the file to indicate the BEL and SOH characters.

This issue wasn't there with Firefox 11, and I first noticed it in Firefox 12. It doesn't seem to be fixed in Firefox 13 Beta 4.

Comment 1

[Heffebaycay]

Forgot to add two screenshots to make the issue easier to understand.

Actual results: http://dl.dropbox.com/u/21565521/firefox-chars-nok.jpg

Expected results: http://dl.dropbox.com/u/21565521/firefox-chars-ok.jpg

Comment 2

[Masatoshi Kimura [:emk]]

Fixed by bug 909344.

Comment 3

[Jonathan Kew [:jfkthame]]

(In reply to Masatoshi Kimura [:emk] from comment #2)
> Fixed by bug 909344.

...which has been backed out from Fx28 in bug 947588, so this is now *un*fixed on 28, though still fixed on trunk (Fx29).

Depending what happens with bug 947588, this might end up being considered as WONTFIX or INVALID.

Comment 4

[Stefan]

1.

Comment 5

[Jonathan Kew [:jfkthame]]

This has now been fixed by bug 1099557, following agreement among implementers in the CSS WG that all browsers should make stray control characters visible. The change should appear in Firefox 43, if all goes smoothly.