Note that I'm intentionally *not* leaving a blank line between the license
block and the "IWYU pragma" line, in nsDisplayItemTypesList.h. This matches the
prevailing style that I found in other files that have "IWYU pragma" lines.
I copied the boilerplate comment directly from the Coding Style MDN page:
https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Coding_Style#Mode_Line
MozReview-Commit-ID: ACoHkDFe8Z3
--HG--
extra : rebase_source : 374d28fea72cfb76043bde724120877b15092d01
I've chosen this approach mainly because there's no other good way to guarantee
the model is correct than holding the snapshots alive until a style refresh.
What I tried before this (storing them in a sort of "immutable element data") is
a pain, since we call into style from the frame constructor and other content
notifications, which makes keeping track of which snapshots should be cleared an
which shouldn't an insane task.
Ideally we'd have a single entry-point for style, but that's not the case right
now, and changing that requires pretty non-trivial changes to the frame
constructor.
MozReview-Commit-ID: FF1KWZv2iBM
--HG--
extra : rebase_source : b02d516ea164fc567110338411bf6ba251d53dab
Sylvestre Ledru
Markus Stange
Daniel Holbert
Emilio Cobos Álvarez
Cameron McCormack