Bug 1427292 broke display: contents on non-special MathML elements.
Just for reference, I've manually audited calls to nsIFrame::GetContent() in
MathML and turns out that MathML is pretty well-behaved in that sense (it
inspects the frame tree, then gets the content), so it should work fine with
display: contents / ShadowDOM.
Only exception to that is[1], but that one seems harmless.
[1]: https://searchfox.org/mozilla-central/rev/eeb7190f9ad6f1a846cd6df09986325b3f2c3117/layout/mathml/nsMathMLmactionFrame.cpp#301
So we can enable or implement when the CSSWG pleases.
MozReview-Commit-ID: 8N6kiGyjE4i
It's the last thing we check before looking into the array, modulo other two
tags, so there should be no need for something more fancy.
MozReview-Commit-ID: 4Wi1fe7jBlN
I left some IgnoredErrorResults for now where people warn on failure. We could
consider adding a WarnOnError() thing or something.
MozReview-Commit-ID: L5ttZ9CGKg0
I'm pretty sure this is not a problem now, since we don't mutate the DOM from
painting, and we don't have legacy extensions anymore.
Just to confirm, I did a try run with a RELEASE_ASSERT(!CheckDOMModified()), and
it passed.
MozReview-Commit-ID: HTekD8tsz9v
Servo tries to keep this invariant that stuff under a display: none element
subtree doesn't get styled.
This invariant isn't checked in StyleNewChildRange, but we can fix this by just
doing the work after finding an insertion point, which guarantees that.
Do the same for listboxes, since we also style early for them without knowing
whether they actually have a listbox parent frame.
MozReview-Commit-ID: Glyx24wQ6qY
The whole function doesn't have much sense.
I killed its only DOM use in bug 1427511.
Now it only has two callers in nsCSSFrameConstructor, which basically only want
to know whether the children of the same node can have different flattened tree
parents.
So let's check that directly instead (checking whether the element has a binding
or a shadow root), and simplify a bit other surrounding code while at it.
Leave the XUL popup / menubar code doing the broken thing they were doing
beforehand, because it doesn't look to me like it's trivial to fix... They're
effectively assuming that the children of the menupopup end up in a single
insertion point, which is true, but doesn't need to be. Maybe they should walk
the DOM tree? Don't want to dig into that right now, since XUL insertion points
can be filtered and all that... Not fun.
Also, this removes the broken optimization that used to check
mParentFrame->GetContent()->HasChildren(), because it's pretty broken. It used
to be relevant before bug 653881, because <children> element used to not exist,
but now the insertion point at least needs to contain the <children> element all
the time.
There even used to be a XXX comment saying that the optimization didn't work,
which was removed in:
https://hg.mozilla.org/mozilla-central/rev/2d8585ec74b3
We could still check for "no insertion points", and optimize that, but it
doesn't seem worth it.
MozReview-Commit-ID: L4lspkxKENr
The whole function doesn't have much sense.
I killed its only DOM use in bug 1427511.
Now it only has two callers in nsCSSFrameConstructor, which basically only want
to know whether the children of the same node can have different flattened tree
parents.
So let's check that directly instead (checking whether the element has a binding
or a shadow root), and simplify a bit other surrounding code while at it.
Leave the XUL popup / menubar code doing the broken thing they were doing
beforehand, because it doesn't look to me like it's trivial to fix... They're
effectively assuming that the children of the menupopup end up in a single
insertion point, which is true, but doesn't need to be.
Maybe they should walk the DOM tree? Don't want to dig into that right now,
since XUL insertion points can be reordered and all that... Not fun.
MozReview-Commit-ID: L4lspkxKENr
We remove async from the DOM all the time now since bug 1389743.
We could, before this patch, recurse into frame construction in a sync way, due
to the way we handle the weird insertion cases for <fieldset>, <details>, and
<mathml>.
This patch makes those also async, making the IssueSingleInsertNotifications
condition unnecessary.
MozReview-Commit-ID: LujPaYPwA4G
Now that accessing nsIContent slots is not a blob of virtual function calls, we
should be able to unify logic here, and speed up the not-so-rare case for
chrome, while keeping the usual case fast.
MozReview-Commit-ID: 87iY5Cbhx4T
This makes the pres shell be notified as the last observer unconditionally.
In practice this doesn't matter, and it may already be the case if an iframe
goes display: none and back. In practice, the only dependency that requires this
order is that the pres shell needs to be notified _after_ the content sink, so
we don't try to enter frame construction before beginning the shell update.
That may be worth looking into, but definitely not in the scope of this bug... :)
MozReview-Commit-ID: 9WeJ5kaUtBq
This feature is intended to help Firefox frontend developers experiment with
replacing XUL content with modern flexbox. We might also eventually use
this emulation to *actually* render most or all of our legacy XUL UI.
MozReview-Commit-ID: 3g2W9o3t23H
XUL popups (i.e. FrameConstructionItem instances with mIsPopup==true) behave
like out-of-flow content -- in particular, they generate nsPlaceholderFrame
instances. So, they need the same placeholder-wrapping behavior that we have
for other out-of-flow frames inside of an emulated legacy box, in order to
satisfy our existing invariants.
MozReview-Commit-ID: KnspN4kTPnx
This patch does not change behavior. This patch just refactors the logic in
IsXULDisplayType so that -moz-box and -moz-inline-box are handled via a
dedicated early-return. This lets a later patch in this series make a more
understandable targeted tweak to add pref-controlled behavior for these display
values.
MozReview-Commit-ID: 6keGrxJcA5l
Now that (per previous patch) NS_STATE_FLEX_IS_EMULATING_LEGACY_BOX isn't just
a webkit-box-specific tag: this patch here generalizes the variable-names and
comments associated with that flag in nsCSSFrameConstructor.cpp.
This patch does not make any changes to behavior; it's simply renaming &
comment tweaks.
MozReview-Commit-ID: DcF5GirAQwD
This patch isn't changing semantics of this bit at all - it just renames it to
a more general name. In other words, this patch does not change behavior.
MozReview-Commit-ID: 4wb13X4YinJ
The LastContinuation stuff behavior was what we did before the other patches, so
let's do that all the time to avoid surprises, though unfortunately I don't have
test-cases.
This effectively restores exactly the same behavior we had before all my frame
constructor patches, just with less code.
MozReview-Commit-ID: IkQ3H3rtlQM
Instead, handle the display: contents case and the ::after case using
FindNextSibling.
The removal of line frames is moved up to not interfere with the insertion point
computation.
Also parentAfterFrame is renamed to nextSibling, which is more relevant to what
it was doing with display: contents.
MozReview-Commit-ID: 1cqclsGQlaw
The only reason not to do that is when there's after content in there. We know
that there isn't really any ::after content, since it would've been handled by
FindNextSibling, so we know we're performing a real append.
MozReview-Commit-ID: ExoPolZy4gG
