fix(drag-drop): preview matchSize sometimes incorrect inside flex container #19062
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We create a custom preview through
ViewContainerRef.createEmbeddedView
and we move it to the correct place in the DOM. The problem is that for the brief period that it's in the DOM, we also measure the host node if thematchSize
option is set. In some cases (e.g. a flex container), this can throw off the size. These changes switch to measuring the size ahead of time when necessary.Fixes #19060.