fix: Hide content highlight on comment drag, update on resize. #2400
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The basics
The details
Resolves
Fixes #2330
Proposed Changes
Temporarily hides the content highlight when a workspace comment drag is initiated, and reveals it with an updated rectangle when the drag is completed. This is consistent with how block drags are handled.
When a workspace comment resize is completed, the content highlight rectangle is updated. (There's currently no event representing the start of a resize drag, but it's better than nothing.)
Reason for Changes
For consistency with moving regular blocks.
Test Coverage
None.
Documentation
N/A
Additional Information
This PR should not be submitted until the an update is published for the core Blockly library containing: google/blockly#8217