Backport of "videodecoder: don't copy interlace-mode from reference state" into 1.18 (!859) · Merge requests · GStreamer / gst-plugins-base

Backport of !852 (merged) "videodecoder: don't copy interlace-mode from reference state".

Commits:

a19a27a4 videodecoder: add interlace-mode to debug output when setting output state
a3a2992b videodecoder: fix output state interlace-mode
44b1fb03 video-info: clarify GST_VIDEO_INTERLACE_MODE_ALTERNATE doc

Backport of "videodecoder: don't copy interlace-mode from reference state" into 1.18