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mat-expansion-panel keeps contents of collapsed panels in DOM · Issue #20680 · angular/components · GitHub
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Angular material expansion panel inside accordion - dragged item looks like two items being dragged · Issue #102 · SortableJS/ngx-sortablejs · GitHub
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angular - mat-expansion-panel, content doesnt recover his original height after closing a panel - Stack Overflow
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mat-expansion-panel "opens" with angular enter-leave animations, although current state is closed. · Issue #11765 · angular/components · GitHub
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