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fix(material/expansion): panel content visible when placed inside a hidden parent #27438

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Jul 12, 2023
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fix(material/expansion): panel content visible when placed inside a hidden parent #27438

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5 changes: 4 additions & 1 deletion src/material/expansion/expansion-animations.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,10 @@ export const matExpansionAnimations: {
/** Animation that expands and collapses the panel content. */
bodyExpansion: trigger('bodyExpansion', [
state('collapsed, void', style({height: '0px', visibility: 'hidden'})),
state('expanded', style({height: '*', visibility: 'visible'})),
// Clear the `visibility` while open, otherwise the content will be visible when placed in
// a parent that's `visibility: hidden`, because `visibility` doesn't apply to descendants
// that have a `visibility` of their own (see #27436).
state('expanded', style({height: '*', visibility: ''})),
transition(
'expanded <=> collapsed, void => collapsed',
animate(EXPANSION_PANEL_ANIMATION_TIMING),
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