layout: Don't default to fallback fonts for spaces (#32442)

Previously, when deciding the font for a space, preference was given to
the previous used font. This could means that the font chosen was a
fallback font instead of the first font that supporting the space
character in the font preference list.

This caused an issue rendering emojis surrounded by spaces with "Noto
Color Emoji" which has a space character the same size as the emoji,
leading to too much spacing between them.

Co-authored-by: Rakhi Sharma <atbrakhi@igalia.com>

components/layout_2020/flow/inline/text_run.rs

@@ -386,7 +386,7 @@ fn char_prevents_soft_wrap_opportunity_when_before_or_after_atomic(character: ch
 /// character are not rendered at all, so it doesn't matter what font we use to render them. They
 /// should just be added to the current segment.
 fn char_does_not_change_font(character: char) -> bool {
-    if character.is_whitespace() || character.is_control() {
+    if character.is_control() {
         return true;
     }
     if character == '\u{00A0}' {

tests/wpt/meta/css/CSS2/fonts/fonts-012.xht.ini

@@ -1,2 +0,0 @@
-[fonts-012.xht]
-  expected: FAIL

tests/wpt/meta/css/css-fonts/font-face-unicode-range-2.html.ini

@@ -1,2 +0,0 @@
-[font-face-unicode-range-2.html]
-  expected: FAIL