HLS: Don't include map data if discontinuity/end of playlist was decrypted

The decrypt() call just before it would have included the map data for us, as it was needed to decrypt. Therefore, it would not need to be added again when merge_discontinuity() is called. In some cases re-adding the map data can cause playback or final merge failure.

devine/core/manifests/hls.py

@@ -365,7 +365,7 @@ class HLS:
 
                 return decrypted_path
 
-            def merge_discontinuity(include_this_segment: bool):
+            def merge_discontinuity(include_this_segment: bool, include_map_data: bool = True):
                 """
                 Merge all segments of the discontinuity.
 
@@ -377,6 +377,8 @@ class HLS:
                         list of segments to merge and decrypt. This should be False if
                         decrypting on EXT-X-KEY changes, or True when decrypting on the
                         last segment.
+                    include_map_data: Whether to prepend the init map data before the
+                        segment files when merging.
                 """
                 last_segment_i = max(0, i - int(not include_this_segment))
 
@@ -392,7 +394,7 @@ class HLS:
                         to=to_path,
                         via=files,
                         delete=True,
-                        include_map_data=True
+                        include_map_data=include_map_data
                     )
 
             if isinstance(track, Subtitle):
@@ -408,7 +410,10 @@ class HLS:
             if segment.discontinuity and i != 0:
                 if encryption_data:
                     decrypt(include_this_segment=False)
-                merge_discontinuity(include_this_segment=False)
+                merge_discontinuity(
+                    include_this_segment=False,
+                    include_map_data=not encryption_data or not encryption_data[2]
+                )
 
                 discon_i += 1
                 range_offset = 0  # TODO: Should this be reset or not?
@@ -468,7 +473,10 @@ class HLS:
                 # required as it won't end with EXT-X-DISCONTINUITY nor a new key
                 if encryption_data:
                     decrypt(include_this_segment=True)
-                merge_discontinuity(include_this_segment=True)
+                merge_discontinuity(
+                    include_this_segment=True,
+                    include_map_data=not encryption_data or not encryption_data[2]
+                )
 
             progress(advance=1)