146303 - [FIX POS]{inc}Weird margin changing after first load.

Status: RESOLVED DUPLICATE of bug 90270

(Core :: Layout, defect, P3)

Description

[dylang]

This is one of those weird style bugs that crops up from time to time.  In this
case, the calendar on the left side is first rendered properly with a margin
between its top and the top of the web window.  However, on reload or clicking
any of those links, Mozilla re-renders this page without the margin.

It's very weird because nothing changes on the server side between the two
reloads: Mozilla is deciding to not render that margin past the first time. 
Perhaps some variable is (incorrectly) re-initialized in the code?

Comment 1

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Looks like an incremental reflow problem.

Comment 2

[Chris Waterson]

The calendar appears to be `position: fixed', which would make me think this
isn't a margin problem. Regardless, I'm not seeing the problem on a trunk build...

Comment 3

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Should be easy to see by resizing the page after it loads.

Comment 4

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Mmm, it's probably something with the fun
auto-offset-at-the-static-position-position code.

Comment 5

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

->Layout

Comment 6

[Boris Zbarsky [:bzbarsky]]

Yeah, that code basically sets "position: fixed" and then sets top, bottom, and 
height all to auto.  Almost certainly a dup of bug 90270

Comment 7

[Greg K.]

Apparently WorksForMe using FizzillaCFM/2002071208. Adding qawanted; could use a
minimized testcase.

Comment 8

[dylang]

Here are some screen shots illustrating the behaviour:

First loaded (not the spacing between the top of the window viewport and the
left-hand nav bar -- the navbar top is also slightly corrupted because of a bug
WRT changing fonts and properly redrawing everything which I haven't filed):
http://web.thock.com/mozilla/moz-fixpos-inc-1.png

After pressing reload, the margin "disapears" and never returns unless I surf in
(rather than press reload/go button).  Different code paths yield different
stylesheet results, it seems:
http://web.thock.com/mozilla/moz-fixpos-inc-2.png

I'll see what I can do about a minimal test case.

Comment 9

[Ramesh]

Layout of the site has changed. However, behaviour reported here seems to
persist: see http://inoshiro.com/changelog/?date=2002.08.01 and
http://inoshiro.com/changelog/?date=2002.07.01. Working on minimal test case.

Comment 10

[Ramesh]

Behaviour seen when page is/isn't large enough for the scroll bars to appear.
Attaching test cases.

Comment 11

[Ramesh]

Attachment: test case

Page small, thus scroll bars to not appear. No margin above "box".

Comment 12

[Ramesh]

Attachment: test case to compare with previous submission

Page bigger, to cause scroll bars to appear. Now space/margin appears above
"box".

Comment 13

[Boris Zbarsky [:bzbarsky]]

Yeah, that testcase is fixed by the patch in bug 90270

Comment 14

[Boris Zbarsky [:bzbarsky]]

dup

*** This bug has been marked as a duplicate of 90270 ***