load_template + dump silently drops sticker/text/effect segments from existing drafts

[Morfeu333]

Summary

When loading an existing CapCut draft via Script_file.load_template(path), then calling .dump(path) to save modifications, all segments inside sticker, text, and effect tracks are silently dropped. The tracks themselves are preserved (with empty segments: []), but the actual sticker/text/effect content (along with its keyframes, materials, and positioning) is lost.

This caused a destructive data loss in my workflow — I edited an existing draft programmatically and silently deleted manually-placed user stickers/highlights.

Root cause

In pyJianYingDraft/template_mode.py line 218, function import_track():

if track_type.value.allow_modify and imported_materials:
    for segment_data in json_data.get("segments", []):
        # ... handle Video / Audio / other

The allow_modify flag controls whether segments are imported. Looking at track.py:

sticker = Track_meta(Sticker_segment, 14000, False)   # allow_modify=False
text    = Track_meta(Text_segment, 15000, False)      # allow_modify=False
effect  = Track_meta(Effect_segment, 16000, False)    # allow_modify=False

So for these track types, segments are NEVER iterated/imported. The track is created but with segments=[]. When dump() is later called, the empty tracks export back to JSON with no segments — silently overwriting any existing segments that were on disk.

Reproduction

1. Open CapCut, create a draft with at least one sticker (e.g. Highlight EN Line overlay) with keyframes.
2. Quit CapCut (so the file is settled on disk).
3. Run:

from pyJianYingDraft import Script_file
s = Script_file.load_template(draft_info_json_path)
s.dump(draft_info_json_path)   # no other changes

4. Reopen the draft in CapCut. The sticker track is now empty.

Expected behavior

load_template + dump should be a round-trip preserving operation when no modifications are made. Even for tracks that pyJianYingDraft can't actively edit, segments should be preserved as ImportedSegment (or similar) and round-tripped through dump().

Suggested fix

The else branch already exists in import_track (line 322) for "other types" via ImportedSegment. The issue is the outer condition if track_type.value.allow_modify. Remove that condition (or invert it) so the else branch runs for sticker/text/effect tracks, preserving segments as opaque ImportedSegment objects.

# Inside import_track, after creating track:
for segment_data in json_data.get("segments", []):
    # build common_keyframes (always)
    common_keyframes = build_keyframes_from(segment_data)

    if track_type == Track_type.video:
        # existing video logic, with allow_modify gate
        ...
    elif track_type == Track_type.audio:
        # existing audio logic
        ...
    else:
        # NEW: preserve sticker/text/effect as opaque
        segment = ImportedSegment(segment_data)
        segment.common_keyframes = common_keyframes
        track.segments.append(segment)

ImportedSegment.export_json() should already write back the original dict.

Environment

• pyJianYingDraft: current main (commit b085f7e)
• Python 3.13 / macOS 26.1
• CapCut International 8.5.0

Workaround

Edit the draft_info.json directly with json.load / json.dump instead of using Script_file.load_template + .dump() when the existing draft contains stickers, text, or effects.

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Happy to send a PR if the approach above sounds good.