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layout: Fix several bugs relating to inline borders, padding, and

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margins.

* The code that attempted to strip out borders that span multiple
  fragments in the same element could go wrong if fragments were
  stripped out due to text clumping or whitespace stripping. This patch
  rewrites that code to maintain flags in the inline fragment context
  specifying whether the node is the beginning or end of the element.
  Not only is this easier to maintain, it's closer in spirit to what roc
  originally suggested two years ago: it's isomorphic to "begin element,
  end element" markers for inline layout.

* Padding and margins for spans containing inline-blocks are now
  properly handled via a division of labor between the `InlineBlock`
  fragment and the `BlockFlow` that represents the inline-block.

* Unscanned text fragments may not be joined together into a text run if
  borders, padding, or margins separate them.

Because Servo now matches the rendering of Gecko and WebKit on the
`input_button_margins_a` reftest, I had to modify it to add some
vertical alignment.

The combined effect of all of these fixes places "Advertising" on the
right place on google.com.
This commit is contained in:
Patrick Walton 2015-08-13 09:49:40 -07:00
parent 3f9b6f8586
commit ee8741b7a8
11 changed files with 319 additions and 130 deletions
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14
components/layout/text.rs
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@ -184,7 +184,6 @@ impl TextRunScanner {
};
let (mut start_position, mut end_position) = (0, 0);
for character in text.chars() {
// Search for the first font in this font group that contains a glyph for this
// character.
@ -286,10 +285,15 @@ impl TextRunScanner {
for (logical_offset, old_fragment) in
mem::replace(&mut self.clump, LinkedList::new()).into_iter().enumerate() {
loop {
match mappings.peek() {
Some(mapping) if mapping.old_fragment_index == logical_offset => {}
Some(_) | None => break,
};
match mappings.peek() {
Some(mapping) if mapping.old_fragment_index == logical_offset => {}
Some(_) | None => {
if let Some(ref mut last_fragment) = out_fragments.last_mut() {
last_fragment.meld_with_next_inline_fragment(&old_fragment);
}
break;
}
};
let mut mapping = mappings.next().unwrap();
let run = runs[mapping.text_run_index].clone();