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Auto merge of #16258 - jdm:panic-at-the-ellipsis, r=pcwalton,stshine

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Overwrite default RunInfo values with the first real ones encountered.

TextRunScanner::flush_clump_to_list compares the values in the RunInfo object against the ones determined from the current fragment, but these values can be arbitrary defaults that don't mean anything useful.

---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #14783
- [X] There are tests for these changes

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This commit is contained in:
bors-servo 2017-04-12 23:09:53 -05:00 • committed by GitHub
commit 9c0d8e44a0
4 changed files with 70 additions and 10 deletions
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25
components/layout/text.rs
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@ -234,17 +234,22 @@ impl TextRunScanner {
let flush_run = run_info.font_index != font_index ||
run_info.bidi_level != bidi_level ||
!compatible_script;
let flush_mapping = flush_run || mapping.selected != selected;
let new_mapping_needed = flush_run || mapping.selected != selected;
if flush_mapping {
mapping.flush(&mut mappings,
&mut run_info,
&**text,
compression,
text_transform,
&mut last_whitespace,
&mut start_position,
end_position);
if new_mapping_needed {
// We ignore empty mappings at the very start of a fragment.
// The run info values are uninitialized at this point so
// flushing an empty mapping is pointless.
if end_position > 0 {
mapping.flush(&mut mappings,
&mut run_info,
&**text,
compression,
text_transform,
&mut last_whitespace,
&mut start_position,
end_position);
}
if run_info.text.len() > 0 {
if flush_run {
run_info.flush(&mut run_info_list, &mut insertion_point);