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Fix various issues with overflow clipping
When dealing absolutely positioned items, we should use clip of our containing block, even if our containing block doesn't itself establish a new overflow clip. Additionally, we need to properly handle assigning scroll root ids to fragments of inline elements. We add a test for this behavior.
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commit
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4 changed files with 111 additions and 6 deletions
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@ -92,6 +92,13 @@ fn convert_repeat_mode(from: RepeatKeyword) -> RepeatMode {
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}
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}
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fn establishes_containing_block_for_absolute(positioning: position::T) -> bool {
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match positioning {
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position::T::absolute | position::T::relative | position::T::fixed => true,
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_ => false,
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}
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}
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trait RgbColor {
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fn rgb(r: u8, g: u8, b: u8) -> Self;
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}
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@ -1953,6 +1960,10 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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// we don't want it to be clipped by its own scroll root.
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let containing_scroll_root_id = self.setup_scroll_root_for_block(state);
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if establishes_containing_block_for_absolute(self.positioning()) {
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state.containing_block_scroll_root_id = state.current_scroll_root_id;
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}
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match block_stacking_context_type {
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BlockStackingContextType::NonstackingContext => {
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self.base.collect_stacking_contexts_for_children(state);
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@ -2038,12 +2049,6 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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self.base.scroll_root_id = new_scroll_root_id;
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state.current_scroll_root_id = new_scroll_root_id;
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match self.positioning() {
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position::T::absolute | position::T::relative | position::T::fixed =>
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state.containing_block_scroll_root_id = new_scroll_root_id,
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_ => {}
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}
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containing_scroll_root_id
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}
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@ -2153,6 +2158,11 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
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self.base.scroll_root_id = state.current_scroll_root_id;
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for mut fragment in self.fragments.fragments.iter_mut() {
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let previous_containing_block_scroll_root_id = state.containing_block_scroll_root_id;
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if establishes_containing_block_for_absolute(fragment.style.get_box().position) {
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state.containing_block_scroll_root_id = state.current_scroll_root_id;
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}
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match fragment.specific {
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SpecificFragmentInfo::InlineBlock(ref mut block_flow) => {
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let block_flow = FlowRef::deref_mut(&mut block_flow.flow_ref);
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@ -2162,6 +2172,10 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
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let block_flow = FlowRef::deref_mut(&mut block_flow.flow_ref);
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block_flow.collect_stacking_contexts(state);
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}
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SpecificFragmentInfo::InlineAbsolute(ref mut block_flow) => {
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let block_flow = FlowRef::deref_mut(&mut block_flow.flow_ref);
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block_flow.collect_stacking_contexts(state);
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}
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_ if fragment.establishes_stacking_context() => {
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fragment.stacking_context_id =
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StackingContextId::new_of_type(fragment.fragment_id(),
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@ -2178,6 +2192,7 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
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}
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_ => fragment.stacking_context_id = state.current_stacking_context_id,
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}
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state.containing_block_scroll_root_id = previous_containing_block_scroll_root_id;
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}
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}
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