feat: Make cursor arrow keys behave as per #129 #143
Merged
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Modify
LineCursor
so that movement via arrow keys behaves as described in #129, specifically:Part of #129.
Note that when using the zelos renderer, if you navigate to a whole-block field the cursor temporarily disappears. This is due to (what I will claim is) a bug in marker rendering in Blockly. Rendering works as expected in geras and thrasos.