[Feature/Bugfix] Tagtree use insert context to speed up adding tracks to playlist
I forgot we had duplicated code between playlist.c and tagtree.c this saves
a bit of space and should speed up adding tracks a bit
further I noticed a buf here where there was the potential to return without closing
the opened track search
Change-Id: I15ed8447fc4fe13de5bfeb9fbb59b151e2fbf36a
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