Always cache current frame in sources. #3525
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This PR applies a preliminary change for switching to immutable content in sources by making all source use the caching mode.
Caching is optional in the current model because it has a cost. However, once we switch to immutable content, cached content will not be duplicated so caching will come at no penalty.
Therefore, switching all source to caching by default will simplify the code logic at no penalty.