[Bug 796559] qtdemux: Various segment fixes to properly take segment.offset into account

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796559

--- Comment #17 from Alicia Boya García <aboya at igalia.com> ---
Created attachment 372723
  --> https://bugzilla.gnome.org/attachment.cgi?id=372723&action=edit
gstelement: assert start/stop are set according to seek rate

Seeks are supposed to have a valid start or stop time depending on
whether the rate is positive or negative respectively.

Before, this was left to be enforced by the elements themselves, who
sometimes did not account for these invalid seeks. This patch introduces
assertions in gst_event_new_seek() to ensure such seeks are not created
in the first place.

This patch also fixes one instance of such a seek in filesrc tests. No
other new test failures have become apparent after running `meson test`,
`gst-validate-launcher` and `gst-validate-launcher adaptive`.

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