[Bug 736891] input-selector: Can't unblock after emitting a "block" signal

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=736891

--- Comment #6 from Jan Alexander Steffens (heftig) <jan.steffens at gmail.com> ---
Created attachment 300128
  --> https://bugzilla.gnome.org/attachment.cgi?id=300128&action=edit
patch 1/2

This is now on top of the patch from bug 746518.

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