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layout: Don't touch the inline positions of block children unless they

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are to be reflowed.

See the comment added to
`BlockFlow::propagate_assigned_inline_size_to_children()` for details.

Closes #13704.
This commit is contained in:
Patrick Walton 2016-10-11 15:54:25 -07:00
parent 768a699fa5
commit 06d9e91f7b
2 changed files with 35 additions and 1 deletions
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16
components/layout/block.rs
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@ -1390,8 +1390,22 @@ impl BlockFlow {
// and its inline-size is our content inline-size.
let kid_mode = flow::base(kid).writing_mode;
{
// Don't assign positions to children unless they're going to be reflowed.
// Otherwise, the position we assign might be incorrect and never fixed up. (Issue
// #13704.)
//
// For instance, floats have their true inline position calculated in
// `assign_block_size()`, which won't do anything unless `REFLOW` is set. So, if a
// float child does not have `REFLOW` set, we must be careful to avoid touching its
// inline position, as no logic will run afterward to set its true value.
let kid_base = flow::mut_base(kid);
if kid_base.flags.contains(INLINE_POSITION_IS_STATIC) {
let reflow_damage = if kid_base.flags.contains(IS_ABSOLUTELY_POSITIONED) {
REFLOW_OUT_OF_FLOW
} else {
REFLOW
};
if kid_base.flags.contains(INLINE_POSITION_IS_STATIC) &&
kid_base.restyle_damage.contains(reflow_damage) {
kid_base.position.start.i =
if kid_mode.is_bidi_ltr() == containing_block_mode.is_bidi_ltr() {
inline_start_content_edge