Independent scrolling of the code editor in an embedded Lite app in the playground mode (#10575)
* Make the preview and the code editor scroll independently in an embedded Lite app in the playground mode
* Merge .wrapper to .parent-container
* Refactoring
* Refactoring
* Preview block dominates the height
* add changeset
* Keep code editor height >0 during loading
* Set .code-editor height
* Fix
* add changeset
* Set default layout as horizontal
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