store block comment position in block data #10164
Merged
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fixes microsoft/pxt-microbit#5889
one of the additions we made in pxt-blockly was the ability for block comments to serialize their position to the XML when saving workspaces. unfortunately, we can't do the same thing with unforked blockly because there are no extension points in the XML serialization of comments. however, blockly does have a data element on blocks that you can stick arbitrary data into and will get saved in the XML (we already use this for persisting data for some of our field editors)
this pr brings back the saving of the comment position by shoving it into the block's data element. note that this will not fix existing projects from before the blockly upgrade, but i really don't think anyone will notice.