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Previously the blocks editor would only highlight a procedure block
when the "Highlight Definition" context menu item was chosen. This
version will also scroll the workspace so that the definition block is
visually centered in the workspace when possible, with a constraint
that the top-left coordinate must appear on the screen.

Fixes #984

Change-Id: If8c06825b285ad7008cbf6f7e7948392be12c0c0