1547684 - Floating, recalculating ist not working properly on resize if two fixed width elements move into each other

Status: NEW

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

Description

[dobiasch]

Attachment: floating-bug.gif

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Steps to reproduce:

https://codepen.io/dst-dev/pen/KYYpEx

Check the codepen sample, see attached gif

Actual results:

Text flow doesn't get recalculated

Expected results:

Text should flow around figure

Comment 1

[Emilio Cobos Álvarez (:emilio)]

At first I thought this could be a regression from the recent reflow root optimizations, but it seems it's a very old bug.

It looks like we're not realizing that due to the auto-margin the resize of the container can affect how much the float overlaps the paragraph, though I haven't dug into why.

Comment 2

[Emilio Cobos Álvarez (:emilio)]

Attachment: Reporter's test-case.

Comment 3

[Emilio Cobos Álvarez (:emilio)]

Attachment: Reduced test-case.

Comment 4

[Alice0775 White]

Regression window using attachment 9077387 [details]:

Last Good: 2006-12-07-04-trunk
First Bad: 2006-12-08-04-trunk
(http://archive.mozilla.org/pub/firefox/nightly/2006/12/ )

Regressed by:
Bug 300030 - (reflow-refactor) Refactor intrinsic width computation out of nsIFrame::Reflow