When adding tracks to the playlist, clear the search filter first, so
the playlist doesn't become all jumbled, or so we don't overflow the
playlist indexes.
Also add some bug fixes for reversing the arranged to disarranged index
lists, so if an arranged index is past the end of the arranged list, as
is the case for appending, we shift the indexes forward past the end of
the diarranged object list.
Extra exception handling was added as well, so these things will only
cause a failure to add playlist items at worst, instead of crashing the
player entirely.
Signed-off-by: Christopher Snowhill <kode54@gmail.com>
80e909fbbe