245480 - strange characters on page confuse text-selecting algorithm

Status: NEW

(Core :: DOM: Selection, defect, P5)

Description

[Matus Horvath]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6) Gecko/20040206 Firefox/0.8
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6) Gecko/20040206 Firefox/0.8

Selecting text on a line with strange characters (see Rreproducing below) with
mouse causes Firefox to start selecting not under the cursor but a few
characters to the right.

Reproducible: Always
Steps to Reproduce:
1. Go to http://bash.org/?browse&p=88
2. Find #10260 on the page
3. Try to select the text "I took my ps2 to florida" with mouse.

Actual Results:  
The text " my ps2 to florida, and " gets selected.

Expected Results:  
"I took my ps2 to florida" should have been selected.

No themes. TabBrowser Extensions installed. Windows XP Pro, English.

Comment 1

[Jesse Ruderman]

Confirmed at http://bash.org/?10260 with Mozilla/5.0 (Windows; U; Windows NT
5.1; en-US; rv:1.8a2) Gecko/20040601 Firefox/0.8.0+.

Also happens in Seamonkey, so -> Selection.

Comment 2

[Hermann Schwab]

Attachment: testcase

short testcase with text from http://bash.org/?10260,
view-source:http://bash.org/?10260 also disturbed.
Have a look at the source of the testcase, some tags are overlapping the text.
Starnge characters are STX,ETX, SI, i.e. 0x02, 0x03, 0x0F.

Comment 3

[Robert Barnhardt]

I believe (well, I'm quite sure) this is directly related to bug #248708,
'Problem with rendering & selection of "ignorable" characters...', and both of
these bugs are at least laterally related to bug/patch #205387, 'need to exclude
truly invisible default_ignorable_code_point's from draw_string.'

(Thanks to MartijnW for pointing out the connection.)

Both of the above are (ostensibly) Win32:GFX bugs, so you may want to
recategorise this bug -- just a suggestion, of course.

Comment 4

[Jens Stutte [:jstutte]]

Bulk-downgrade of unassigned, >=5 years untouched DOM/Storage bugs' priority and severity.

If you have reason to believe this is wrong, please write a comment and ni :jstutte.