feat(drag-drop): allow for custom class to be set on preview - #17304
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When we create a preview for a dragged element, we put it in the `body` in order to avoid issues with `z-index` and `overflow`, however this makes it harder to style the element. When the previews were implemented initially, the thinking was the users could customize it either by providing a custom preview, in which case they can set as many classes as they want, or by targeting something like `.some-element.cdk-drag-preview` if they're using the default one. The problem with the latter is that it doesn't allow for something like a theme to be propagated to the preview. These changes add an extra input that allows users to set a class on the preview element for easier customization. Fixes angular#17089.
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When we create a preview for a dragged element, we put it in the
bodyin order to avoid issues withz-indexandoverflow, however this makes it harder to style the element. When the previews were implemented initially, the thinking was the users could customize it either by providing a custom preview, in which case they can set as many classes as they want, or by targeting something like.some-element.cdk-drag-previewif they're using the default one. The problem with the latter is that it doesn't allow for something like a theme to be propagated to the preview.These changes add an extra input that allows users to set a class on the preview element for easier customization.
Fixes #17089.