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fix(material/tabs): prevent tab header from collapsing when empty inside a drop list #29418

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Jul 16, 2024
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fix(material/tabs): prevent tab header from collapsing when empty inside a drop list #29418

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14 changes: 14 additions & 0 deletions src/material/tabs/_tabs-common.scss
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Original file line number Diff line number Diff line change
Expand Up @@ -393,6 +393,20 @@ $mat-tab-animation-duration: 500ms !default;
[mat-align-tabs='end'] > #{$parent} & {
justify-content: flex-end;
}

// Prevent the header from collapsing when it is a drop list. This is useful,
// because its height may become zero once all the tabs are dragged out.
// Note that ideally we would do this by default, rather than only in a drop
// list, but it ended up being hugely breaking internally.
.cdk-drop-list &,
&.cdk-drop-list {
@include token-utils.use-tokens(
tokens-mdc-secondary-navigation-tab.$prefix,
tokens-mdc-secondary-navigation-tab.get-token-slots()
) {
@include token-utils.create-token-slot(min-height, container-height);
}
}
}

// Structural styles for the element that wraps the paginated container's content.
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