layout: Move text decoration propagation to stacking context tree construction (#37069)

Text decorations have a special kind of propagation. Instead of
propating these during box tree construction, move propagation to
stacking context tree construction. This will allow for using a very
easy type of incremental layout when text decorations change. For
instance, when a link changes color during hovering over it, we can skip
all of box and fragment tree construction.

In addition, propagation works a bit better now and color and style
properly move down from their originating `Fragment`s.

This introduces three new failures, because now we are drawing the
text-decoration with the correct color in more places, which exposes an
issue we have with text-decorations not being drawn in relation to the
baseline (taking into account `vertical-align`).

Testing: There are tests for these changes.
Fixes #31736.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>

components/layout/construct_modern.rs

@@ -150,7 +150,6 @@ impl<'a, 'dom> ModernContainerBuilder<'a, 'dom> {
 
                     let inline_formatting_context = inline_formatting_context_builder.finish(
                         self.context,
-                        self.propagated_data,
                         true,  /* has_first_formatted_line */
                         false, /* is_single_line_text_box */
                         self.info.style.writing_mode.to_bidi_level(),