CG display list graphics contexts are sometimes still flipped

[hortont424]

9502f85

CG display list graphics contexts are sometimes still flipped
https://bugs.webkit.org/show_bug.cgi?id=250816
rdar://104388673

Reviewed by Dean Jackson.

* Source/WebKit/Shared/RemoteLayerTree/CGDisplayListImageBufferBackend.mm:
(WebKit::GraphicsContextCGDisplayList::GraphicsContextCGDisplayList):
Remove the workaround introduced in r252402@main, since we have reinstated the toplevel
context flip in 258997@main. I missed this in 258997@main because it only affects
cases where we end up doing setCTM(getCTM()), which is just rare enough to miss
with cursory testing.

* Source/WebKit/Shared/RemoteLayerTree/RemoteLayerBackingStore.h:
* Source/WebKit/Shared/RemoteLayerTree/RemoteLayerBackingStore.mm:
(WebKit::RemoteLayerBackingStore::paintContents):
(WebKit::RemoteLayerBackingStore::drawInContext):
While debugging the above, I also noticed that we were leaving the display
list context with a missing trailing `restore` operation, because we encode the
display list inside drawInContext. To avoid this, move the flip inside our existing
state saver, which is popped before encoding the display list. This has no
actual effect at the moment (except making the dumped list look more correct),
but will eventually be necessary when the replayed destination context is reused.

Canonical link: https://commits.webkit.org/259076@main

178d352

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk	❌ 🛠 wincairo
✅ 🧪 webkitperl	⏳ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 gtk-wk2
	⏳ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
✅ 🛠 🧪 merge	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 3a3af8d)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	🛠 ios	🛠 mac	✅ 🛠 wpe
	✅ 🛠 ios-sim	🛠 mac-AS-debug	🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	🧪 ios-wk2	🧪 api-mac	🧪 gtk-wk2
	🧪 api-ios	🧪 mac-wk1	🧪 api-gtk
	✅ 🛠 tv	🧪 mac-wk2
	🛠 tv-sim	🧪 mac-AS-debug-wk2
	🛠 watch	🧪 mac-wk2-stress
	🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 4c84f02)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
🧪 style	🛠 ios	🛠 mac	🛠 wpe
	🛠 ios-sim	🛠 mac-AS-debug	🛠 gtk	🛠 wincairo
🧪 webkitperl	🧪 ios-wk2	🧪 api-mac	🧪 gtk-wk2
	🧪 api-ios	🧪 mac-wk1	🧪 api-gtk
	🛠 tv	🧪 mac-wk2
	🛠 tv-sim	🧪 mac-AS-debug-wk2
	🛠 watch	🧪 mac-wk2-stress
	🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash 178d352)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk	❌ 🛠 wincairo
✅ 🧪 webkitperl	⏳ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 gtk-wk2
	⏳ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
✅ 🛠 🧪 merge	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 259076@main (9502f85): https://commits.webkit.org/259076@main

Reviewed commits have been landed. Closing PR #8810 and removing active labels.