Split line layout into two phases (#30089)

In the first phase, we gather LineItems and then when we have enough to
form a line we turn them into Fragments. This will make it possible to
more simply implement `vertical-align` and `text-align: justify` because
we need to measure the different aspects of the candidate line and then
produce a Fragments.

This is a general refactor of the way that inline layout works, so comes
with some progressions. In addition there are some new failures.

New failures:

Some tests are now failing because only the test or reference is getting
proper line height when it wasn't before. These should be fixed in a
followup change that properly calculate line-height in more cases:

 - /_mozilla/css/list_style_position_a.html
 - /css/CSS2/floats/float-no-content-beside-001.html
 - /css/css-content/pseudo-element-inline-box.html
 - /css/css-flexbox/flexbox_flex-none-wrappable-content.html

Some tests are now failing because floats are now placed properly, but
are no longer in their inline box stacking contexts. These will be fixed
by a followup change which properly parents them:

- /css/filter-effects/filtered-inline-applies-to-float.html.ini
- /css/css-color/inline-opacity-float-child.html.ini

One test is failing due to floating point precision errors:

- /css/CSS2/floats-clear/floats-141.xht.ini

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>

tests/wpt/meta/css/CSS2/abspos/remove-block-between-inline-and-abspos.html.ini

@@ -1,2 +0,0 @@
-[remove-block-between-inline-and-abspos.html]
-  expected: FAIL

tests/wpt/meta/css/CSS2/box-display/block-in-inline-007.xht.ini

@@ -1,2 +0,0 @@
-[block-in-inline-007.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/floats-clear/floats-141.xht.ini

@@ -0,0 +1,2 @@
+[floats-141.xht]
+  expected: FAIL

tests/wpt/meta/css/CSS2/floats/float-no-content-beside-001.html.ini

@@ -0,0 +1,2 @@
+[float-no-content-beside-001.html]
+  expected: FAIL

tests/wpt/meta/css/CSS2/floats/float-nowrap-4.html.ini

@@ -1,2 +0,0 @@
-[float-nowrap-4.html]
-  expected: FAIL

tests/wpt/meta/css/CSS2/floats/floats-placement-vertical-001b.xht.ini

@@ -1,2 +0,0 @@
-[floats-placement-vertical-001b.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/floats/floats-placement-vertical-001c.xht.ini

@@ -1,2 +0,0 @@
-[floats-placement-vertical-001c.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/normal-flow/block-non-replaced-width-007.xht.ini

@@ -1,2 +0,0 @@
-[block-non-replaced-width-007.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/text/text-indent-on-blank-line-rtl-left-align.html.ini

@@ -1,2 +0,0 @@
-[text-indent-on-blank-line-rtl-left-align.html]
-  expected: FAIL

tests/wpt/meta/css/CSS2/text/white-space-008.xht.ini

@@ -1,2 +0,0 @@
-[white-space-008.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/text/white-space-normal-007.xht.ini

@@ -1,2 +0,0 @@
-[white-space-normal-007.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/zindex/stack-floats-003.xht.ini

@@ -1,2 +0,0 @@
-[stack-floats-003.xht]
-  expected: FAIL

tests/wpt/meta/css/css-color/inline-opacity-float-child.html.ini

@@ -0,0 +1,2 @@
+[inline-opacity-float-child.html]
+  expected: FAIL

tests/wpt/meta/css/css-content/pseudo-element-inline-box.html.ini

@@ -0,0 +1,2 @@
+[pseudo-element-inline-box.html]
+  expected: FAIL

tests/wpt/meta/css/css-flexbox/flexbox_flex-none-wrappable-content.html.ini

@@ -0,0 +1,2 @@
+[flexbox_flex-none-wrappable-content.html]
+  expected: FAIL

tests/wpt/meta/css/css-position/position-relative-003.html.ini

@@ -1,2 +0,0 @@
-[position-relative-003.html]
-  expected: TIMEOUT

tests/wpt/meta/css/css-position/position-relative-004.html.ini

@@ -1,2 +0,0 @@
-[position-relative-004.html]
-  expected: TIMEOUT

tests/wpt/meta/css/filter-effects/filtered-inline-applies-to-float.html.ini

@@ -0,0 +1,2 @@
+[filtered-inline-applies-to-float.html]
+  expected: FAIL

tests/wpt/mozilla/meta/css/input_whitespace.html.ini

@@ -1,2 +0,0 @@
-[input_whitespace.html]
-  expected: FAIL

tests/wpt/mozilla/meta/css/list_style_position_a.html.ini

@@ -0,0 +1,2 @@
+[list_style_position_a.html]
+  expected: FAIL