53985 - space before <br> at end of line with no room left gets wrapped to next line

Status: VERIFIED DUPLICATE of bug 25680

(Core :: Layout, defect, P3)

Description

[Hixie (not reading bugmail)]

This broke out of bug 13097.

The code fragment:

   <div>
     some text just long enough to fit on the line <br> some more text
   </div>

...renders as:
  
   some text just long enough to fit on the line
   
   some more text

Note the extra blank line.

This is easily reproducable if you use images instead of text, and a fixed
width DIV or table cell to hold them in.

STEPS TO REPRODUCE:
  See test case: 
  http://www.bath.ac.uk/%7Epy8ieh/cgi/development/tests/linemodel1?mode=standard

EXPECTED RESULTS:
  Only a few pixels between each line, except the last one in each block 
  (<br><br>) which should have a whole blank line.

ACTUAL RESULTS:
  As expected except for the " <br>" cases when the width of the line is equal
  to or less than the length of the "text" (actually an image) on the line.

TESTED ON:
  Known to be broken on All/All.

Comment 1

[Hixie (not reading bugmail)]

RELEASE NOTE ITEM:
   Mozilla currently does not ignore whitespace before a <br>, which in
   certain rare cases can cause an extra blank line to be inserted in the
   rendering. See bug 53985 for more details. Workaround: remove any spaces
   before a <br> element, or avoid use of this element altogether.

Comment 2

[Fabian Guisset]

Hixie, isn't this kinda the same as bug 25680?

Comment 3

[Hixie (not reading bugmail)]

good catch!

*** This bug has been marked as a duplicate of 25680 ***

Comment 4

[Fabian Guisset]

and VERIFIED, thanks Hixie.