This addon must be used with version 2.7x
This feature is included by default on 2.8x, with Ctrl+Tab shorcut, so this addon is useless with 2.8x
Switch between GraphEditor and DopeSheet with Z
Based on an idea from Hjalti Hjalmarsson.
(and seems to be also included into Amaranth Addon).
... On BleRiFa website
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