[Bug 763756] gl ! textoverlay ! glupload ! glfilter doesn't negotiate

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763756

--- Comment #2 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
Created attachment 324110
  --> https://bugzilla.gnome.org/attachment.cgi?id=324110&action=edit
glfilter: only allow the same src/sink caps when we are in passthrough

This, I'm not entirely sure about.

While textoverlay ! glcolorbalance ! glimagesinkelement will now work, changing
any of the glcolorbalance properties so it's not in passthrough anymore will
fail negotiating unless you add glupload/gldownload around textoverlay which
will admittedly go (non-)passthrough as required.

The other concern is how this interacts with transform_ip_on_passthrough
although we don't currently have any gl elements that do that so tests for that
are non-existent.

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