278862 - <select size="n"> displays more than n lines when one of the <option> contains corrupted characters

Status: RESOLVED INVALID

(Core :: Layout: Form Controls, defect)

Description

[Vincent de Phily]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20050107
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20050107

When one of the <option> of a select contains an invalid charecter (say a
truncated unicode char), mozilla displays a "?" glyph which is bigger than the
other glyphs. This is fine, but it when this happens mozilla displays more than
the specified number of lines in the select box.

Reproducible: Always

Steps to Reproduce:
1. load testcase
Actual Results:  
Displays about 2n items.

Expected Results:  
Display n items.

Comment 1

[Vincent de Phily]

Attachment: testcase

Comment 2

[Andrew Schultz]

worksforme with linux trunk 2005011705, 1.7.5 and a trunk gtk2/xft build

Comment 3

[Vincent de Phily]

(In reply to comment #2)
> worksforme with linux trunk 2005011705, 1.7.5 and a trunk gtk2/xft build

Is the big "?" glyph used on your setup, or did the system find a suitable glyph
? Only big glyph might trigger the bug.



gtk2/xft/xorg6.8 here as well. Retested on another similar machine (sadly no
other machine available), with same results. 

Comment 4

[Andrew Schultz]

For me, a trunk gtk1 build shows a normal sized ? and a gtk2/xft build shows a
normal sized (reverse-video) ?.  My gtk1 build of 1.7.5 shows a normal sized square.

Comment 5

[Vincent de Phily]

Attachment: Updated testcase using font sizes

Since the "?" glyph size is too dependent on system setting, here is another
testcase using font sizes to trigger the bug.

Comment 6

[Boris Zbarsky [:bzbarsky]]

I'm not sure what you're expecting exactly... The select is told to be big
enough to show N options.  It gets the height of the largest option, multiplies
it by N, and uses that value.

The other possibility is changing the size of the select based on what options
were scrolled into view.  But that looks _really_ weird, so we don't really plan
to do that.