fix: Select replacement for selected shadow block. #2457
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The basics
The details
Resolves
Fixes #2426
Proposed Changes
The shadow block converter plugin now detects if the shadow block being replaced was selected, and if so, it selects the block that took the place of the shadow block.
Reason for Changes
This maintains apparent continuity of the selection when a selected shadow block is edited by the user and replaced with a real block by the shadow block converter plugin.
Note that prior to RaspberryPiFoundation/blockly#8172 clicking on a shadow block actually selected the parent block, and this selection was maintained even if the shadow block was deleted.
After RaspberryPiFoundation/blockly#8172 clicking on a shadow block selects that shadow block. This means that if the shadow block is deleted, then the selection is cleared, which could be unexpected in the case of the shadow block converter plugin. This PR fixes that.
See also RaspberryPiFoundation/blockly#8533 which addresses the visual glitches described in #2426
Test Coverage
I added a unit test method for the new behavior.