[GTK][WPE] Remove support for named spaces and nonzero unitless lengths

[fred-wang]

[GTK][WPE] Remove support for named spaces and nonzero unitless lengths
https://bugs.webkit.org/show_bug.cgi?id=197494

Reviewed by NOBODY (OOPS!).

This commit removes support for named spaces and nonzero unitless
lengths in WebKit when the MathML Core flag is enabled [1] [2],
which is currently the case on GTK and WPE platforms. It also adds
a few more WPT tests to cover attributes implemented in WebKit.

[1] https://developer.mozilla.org/en-US/docs/Web/MathML/Attribute/Values#legacy_mathml_lengths
[2] https://developer.mozilla.org/en-US/docs/Web/MathML/Element/mpadded#legacy_syntax

* LayoutTests/TestExpectations: Remove a test fixed by this change.
* LayoutTests/accessibility/mac/mathml-line-fraction.html: This test uses a nonzero unitless value, so disable the MathML Core.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-001.html: enable MathML Core.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-002-expected.txt: Update expectation.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-002.html: enable MathML Core.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/mpadded/mpadded-legacy-length-values-expected.txt: Added.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/mpadded/mpadded-legacy-length-values.html: Added.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/operators/mo-lspace-rspace-legacy-length-values-expected.txt: Added.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/operators/mo-lspace-rspace-legacy-length-values.html: Added.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/operators/mo-minsize-maxsize-legacy-length-values-expected.txt: Added.
  There seem to be an existing stretching bug unrelated to this change that make maxsize tests fail.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/operators/mo-minsize-maxsize-legacy-length-values.html: Added.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/spaces/mspace-legacy-length-values-expected.txt: Added.
* LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/spaces/mspace-legacy-length-values.html: Added.
* LayoutTests/imported/w3c/web-platform-tests/mathml/relations/css-styling/lengths-2-expected.txt: Update expectation.
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/mathml/relations/css-styling/lengths-2-expected.txt: Ditto.
* LayoutTests/mathml/non-core/positive-namedspace.html: Renamed from LayoutTests/mathml/presentation/positive-namedspace.html.
  This test is specifically tested namedspace so disable disable the MathML Core. Also move it to non-core directory.
* LayoutTests/mathml/non-core/positive-namedspace-expected.html: Ditto.
* LayoutTests/mathml/presentation/mo-form-expected.html: This test uses namedspaces but actually does not need to do so, so tweak it.
* LayoutTests/mathml/presentation/non-bmp-operators-spacing-expected.html: Ditto.
* LayoutTests/mathml/presentation/non-bmp-operators-stretching-expected.html: Ditto.
* Source/WebCore/mathml/MathMLFractionElement.cpp:
(WebCore::MathMLFractionElement::lineThickness): Pass boolean to indicate whether to support legacy MathML lengths.
* Source/WebCore/mathml/MathMLPresentationElement.cpp:
(WebCore::MathMLPresentationElement::parseNumberAndUnit): Make parsing fails for nonzero unitless.
(WebCore::MathMLPresentationElement::parseMathMLLength): Make parsing fails for namedspace and pass boolean to indicate whether to support
  legacy MathML lengths.
(WebCore::MathMLPresentationElement::cachedMathMLLength):
* Source/WebCore/mathml/MathMLPresentationElement.h: Add new boolean to indicate whether to support legacy MathML lengths.

https://github.com/WebKit/WebKit/commit/8158dcf00def149d87534daf64bb09b18aa14095

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/7416a4f343fc651f3662fd66bae6057927063bb3)

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/49c9953770df4469d5b062a3626c480d4ecbf85f)

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/952b5f973aa0e8f44925b746d8ceb46fee9e8102)

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/749d9750366bcdca6663c2fd3117dab3fc016d68)

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/32cb42162c5d5210933d5a440b179c9968263daf)

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/d114c004f985acda26458d5ca8f1007926b11a73)

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/8158dcf00def149d87534daf64bb09b18aa14095)

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

[webkit-early-warning-system]

EWS run on current version of this PR (hash https://github.com/WebKit/WebKit/commit/c02b45bc60aaac324722041b6f8f94963728a92b)

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

[webkit-commit-queue]

Committed 255818@main (f243e31b7e94): https://commits.webkit.org/255818@main

Reviewed commits have been landed. Closing PR #5023 and removing active labels.