gstreamer/testsuite/trigger/README

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caps issues:
- We can't really tell until PAUSED that 'sinesrc ! identity ! ximagesink'
will fail (since identity has ANY as the pad template caps).
Because of this, it's nearly useless to perform the pad
template check.
Alternatives:
proxy pad template caps, but that reinstates the O(N^2) issue
in 0.8 during linking lots of elements.
remove checking of pad template caps compatibility
add a means of checking a pipeline for caps compatibility before
setting to PAUSED (ugly, requires special processing in each
element)