decodebin3: Only unblock for GAP events and buffers.
An alternate fix for gst-plugins-base!1239 (merged) and !1236 (closed) that makes it clear the intent is to only unblock on a GAP event, and not any others.
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An alternate fix for gst-plugins-base!1239 (merged) and !1236 (closed) that makes it clear the intent is to only unblock on a GAP event, and not any others.