184099 - table and caption jump at arbitrary calculation threshold

Status: RESOLVED WORKSFORME

(Core :: Layout: Tables, defect, P3)

Description

[fantasai]

Overview:
    The caption + table layout calculations seem to switch algorithms at an
    arbitrary threshold.

Steps to Reproduce:
    1. Load testcase in a Mozilla window. Don't maximize the window, but
       make it big.
    2. Grab the side of the window and slowly shrink it horizontally. At
       one point, right before the caption switches to three lines, both
       the table and the caption will jump and the margins to the left of
       the table and the right of the caption will equalize.

Expected Results:
    Smooth transition as the window shrinks.

Tested on Mozilla nightly (build id: 2002120604) on Win2k

Additional Comments:

   Try the same thing with attachment 104325 [details] (negative margin + width testcase
   in bug 3166). The negative margin jumps to zero, and if you keep shrinking,
   there are all kinds of strange painting problems, and horizontal scrollbars
   don't appear when needed. I'm not sure if this is the same bug or not.

Comment 1

[fantasai]

Attachment: testcase

Comment 2

[Alan Raskin]

I have encountered a similar rendering problem in a table with a caption under
both Mozilla 1.7.1 and Firefox 0.9.2. When the browser window is wide enough
(i.e. wider than the natural width of the table + the width of some white space
+ the width of the actual vertical scrollbar), the caption renders properly (the
text is centered across the table, and the CSS background colour spans the
complete width of the table). The width of the required white space seems close
to the width of a vertical scrollbar, but that may just be a coincidence.

However, when the window is even just a *tiny* bit too narrow, the caption
collapses to the width of the caption text; the text is pushed all the way to
the left of the table and the background colour only spans the text (i.e. it no
longer spans the complete table). The transition from one behaviour to the other
is very abrupt.

Comment 3

[Bernd]

this is wfm now as the caption shrinks to min size.