1987958 - Determine position fallback based on basic `flip-*` keywords

Status: RESOLVED FIXED

(Core :: CSS Parsing and Computation, enhancement)

Comment 1

[Daniel Holbert [:dholbert]]

For reference, the flip-* syntax here is:
<try-tactic> = flip-block || flip-inline || flip-start

Comment 2

[Emilio Cobos Álvarez [:emilio]]

Attachment: Bug 1987958 - Initial support for position-try-fallback. r=#anchor-pos,#layout

This implements an initial version of position-try-fallback, that
supports only <position-area> and <position-try-tactic> applied to
position area.

Lot's of follow-up work to do, like:

• Applying <position-try-tactic> to margins / paddings / etc.
• @position-try (not too hard)
• Figure out what to do if the abspos should fragment.

But still probably worth landing this.

Comment 3

[Emilio Cobos Álvarez [:emilio]]

Attachment: Bug 1987958 - Move custom containing block computation to ReflowAbsoluteFrame. r=#layout

The checks for fragmentation I think want to use the original containing
block rect.

Using that rect for GetLogicalSize doesn't matter because we already force
kidNeedsReflow = true for orthogonal kids.

This is useful because we're going to need to reflow children multiple
times for position-try.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/54aac9639e3e
https://hg.mozilla.org/integration/autoland/rev/ee394bfab2dc
Move custom containing block computation to ReflowAbsoluteFrame. r=layout-reviewers,jfkthame
https://github.com/mozilla-firefox/firefox/commit/49d75b1297d2
https://hg.mozilla.org/integration/autoland/rev/4502b80d4c43
Initial support for position-try-fallback. r=layout-reviewers,jfkthame
https://github.com/mozilla-firefox/firefox/commit/6bfb7c63ecf3
https://hg.mozilla.org/integration/autoland/rev/5c41c0c0128f
apply code formatting via Lando

Comment 7

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/ee394bfab2dc
https://hg.mozilla.org/mozilla-central/rev/4502b80d4c43
https://hg.mozilla.org/mozilla-central/rev/5c41c0c0128f