fix: share, upload, crop, auto-skip, tag chips and See all hold what they claim

- Share: a link that expired is never copied (the dialog and one-click Share pick a live one,
  else make one), says it expired, and the copy-on-open claim clears on the next copy.
- A password-protected file link asks to open a file, not to watch a video.
- Upload: Cancel, the close button or the backdrop while naming a folder makes no folder; a failed
  refetch keeps the target; a folder being made says so.
- Crop: an infinite number is dropped, not a 500; an unprobed clip's size follows a shown-size crop;
  the edit_spec docs name frame_w/frame_h; the join and rotated paths are tested.
- Auto-skip: the wait gives way on a marker too short for it, so the skip still fires.
- Tag chips count the followed channels (subscribed_count) and a toggled chip keeps the focus.
- Continue watching's See all sorts by last watched when in progress was already on.

backend/tests/test_edit_crop_frame.py

@@ -20,8 +20,10 @@ from app.downloads.models import DownloadJob, MediaAsset
 pytestmark = pytest.mark.skipif(shutil.which("ffmpeg") is None, reason="ffmpeg not available")
 
 
-def _source(path: Path, size: str, box: str, sar: int) -> None:
-    """Red, with the picture's middle half green: a crop of that middle holds no red."""
+def _source(path: Path, size: str, box: str, sar: int, rotate: int = 0) -> None:
+    """Red, with a green box: a crop of the box holds no red. `rotate` tags the file to be shown
+    turned by that many degrees counter-clockwise, as a phone records a portrait video."""
+    tag = ["-display_rotation:v:0", str(rotate)] if rotate else []
     subprocess.run(
         [
             "ffmpeg", "-y", "-loglevel", "error",
@@ -32,6 +34,13 @@ def _source(path: Path, size: str, box: str, sar: int) -> None:
         ],
         check=True,
     )  # fmt: skip
+    if tag:
+        tagged = path.with_name("tagged-" + path.name)
+        subprocess.run(
+            ["ffmpeg", "-y", "-loglevel", "error", *tag, "-i", str(path), "-c", "copy", str(tagged)],
+            check=True,
+        )  # fmt: skip
+        tagged.replace(path)
 
 
 def _red_and_green(path: Path) -> tuple[int, int]:
@@ -50,13 +59,14 @@ def _red_and_green(path: Path) -> tuple[int, int]:
     return red, green
 
 
-def _cut(db, make_user, tmp_path, src: Path, crop: dict) -> Path:
+def _cut_asset(db, make_user, src: Path, spec: dict, then=lambda: None) -> MediaAsset:
     user = make_user()
     source = uploadmod.ingest_upload(
         db, user.id, filename="clip.mp4", src_path=src, size=src.stat().st_size
     )
     assert source.status == "done"
-    job = service.enqueue_edit(db, user.id, source, {"crop": crop})
+    then()
+    job = service.enqueue_edit(db, user.id, source, spec)
     asset = db.get(MediaAsset, job.asset_id)
     job.status, asset.status = "running", "downloading"  # the worker's claim
     db.commit()
@@ -66,6 +76,11 @@ def _cut(db, make_user, tmp_path, src: Path, crop: dict) -> Path:
     db.expire_all()
     job, asset = db.get(DownloadJob, job.id), db.get(MediaAsset, job.asset_id)
     assert (job.status, job.error, asset.status) == ("done", None, "ready")
+    return asset
+
+
+def _cut(db, make_user, tmp_path, src: Path, crop: dict, **spec) -> Path:
+    asset = _cut_asset(db, make_user, src, {"crop": crop, **spec})
     return storage.abs_path(str(tmp_path), asset.rel_path)
 
 
@@ -110,3 +125,64 @@ def test_a_crop_stored_before_it_carried_its_frame_is_cut_as_it_always_was():
 def test_a_frame_that_cannot_be_read_is_not_divided_by(frame):
     spec = edit.normalize_edit_spec({"crop": {"x": 4, "y": 6, "w": 100, "h": 50, **frame}})
     assert spec["crop"] == {"x": 4, "y": 6, "w": 100, "h": 50}
+
+
+def test_a_crop_of_a_join_keeps_what_the_frame_showed(db, make_user, tmp_path, monkeypatch):
+    """A cut-list joins through `filter_complex`, a crop path of its own."""
+    monkeypatch.setattr(settings, "files_root", str(tmp_path))
+    src = tmp_path / "in.mp4"
+    _source(src, "320x240", "x=80:y=60:w=160:h=120", sar=2)
+
+    final = _cut(
+        db, make_user, tmp_path, src,
+        {"x": 160, "y": 60, "w": 320, "h": 120, "frame_w": 640, "frame_h": 240},
+        segments=[{"start_s": 0, "end_s": 0.5}, {"start_s": 1, "end_s": 1.5}], accurate=True,
+    )  # fmt: skip
+
+    assert _red_and_green(final) == (0, 160 * 120)
+
+
+def test_a_crop_of_a_rotated_video_is_cut_where_it_was_drawn(db, make_user, tmp_path, monkeypatch):
+    """The browser shows a rotated file upright, so the frame was drawn on the upright picture."""
+    monkeypatch.setattr(settings, "files_root", str(tmp_path))
+    src = tmp_path / "in.mp4"
+    # Stored 320 x 240, green on its left half; shown turned a quarter, 240 x 320.
+    _source(src, "320x240", "x=0:y=0:w=160:h=240", sar=1, rotate=90)
+
+    # Turned counter-clockwise, the stored left half is the shown bottom half.
+    final = _cut(
+        db, make_user, tmp_path, src,
+        {"x": 0, "y": 160, "w": 240, "h": 160, "frame_w": 240, "frame_h": 320},
+    )  # fmt: skip
+
+    assert _red_and_green(final) == (0, 240 * 160)
+
+
+def test_a_clip_ffprobe_cannot_size_gets_the_size_its_crop_cut(
+    db, make_user, tmp_path, monkeypatch
+):
+    monkeypatch.setattr(settings, "files_root", str(tmp_path))
+    src = tmp_path / "in.mp4"
+    _source(src, "320x240", "x=80:y=60:w=160:h=120", sar=2)
+
+    def probe_fails():
+        monkeypatch.setattr(pipeline.probe, "probe_media", lambda _p: (None,) * 5)
+
+    asset = _cut_asset(
+        db, make_user, src,
+        {"crop": {"x": 160, "y": 60, "w": 320, "h": 120, "frame_w": 640, "frame_h": 240}},
+        then=probe_fails,
+    )  # fmt: skip
+
+    # Half the shown width of a 320-wide file: 160 stored, not the 320 the frame counted.
+    assert (asset.width, asset.height) == (160, 120)
+
+
+@pytest.mark.parametrize("key", ["frame_w", "x"])
+def test_an_infinite_number_in_a_crop_is_dropped_not_a_crash(key):
+    crop = {"x": 4, "y": 6, "w": 100, "h": 50, "frame_w": 640, "frame_h": 240}
+    spec = edit.normalize_edit_spec({"crop": {**crop, key: float("inf")}})
+    if key == "frame_w":
+        assert spec["crop"] == {"x": 4, "y": 6, "w": 100, "h": 50}
+    else:
+        assert "crop" not in spec

backend/tests/test_folder_links.py

@@ -150,6 +150,7 @@ def test_a_password_folder_link_shows_nothing_until_unlocked(shelf, client):
     assert client.get(f"/api/public/watch/{token}").json() == {
         "needs_password": True,
         "kind": "folder",
+        "video": False,
     }
     bare = f"/api/public/watch/{token}/files/{shelf['inside'][0]}/file"
     assert client.get(bare).status_code == 403
@@ -312,7 +313,7 @@ def test_a_password_file_link_says_it_opens_a_file(shelf, client):
         .json()
     )
     meta = client.get(f"/api/public/watch/{made['token']}").json()
-    assert meta == {"needs_password": True, "kind": "file"}
+    assert meta == {"needs_password": True, "kind": "file", "video": True}
 
 
 def test_a_file_whose_bytes_are_gone_is_not_offered(shelf, client, db):

backend/tests/test_reader_service.py

@@ -14,7 +14,7 @@ from sqlalchemy import select
 from sqlalchemy.exc import IntegrityError
 
 from app.discover import pins
-from app.catalog.models import Channel, Video
+from app.catalog.models import Channel, Subscription, Video
 from app.reader import queries, service
 from app.reader.models import ChannelTag, ComfortPin, Playlist, PlaylistItem, Tag, VideoState
 
@@ -60,12 +60,30 @@ def test_a_system_tag_is_nobodys_to_edit(db, make_user):
     service.create_tag(db, other, "Theirs", "other", None)  # another user's tag stays theirs
     db.commit()
     assert queries.own_tag(db, user, system.id) is None
-    assert [t.id for t, _ in queries.tags_with_counts(db, user)] == [system.id]
+    assert [t.id for t, *_ in queries.tags_with_counts(db, user)] == [system.id]
 
 
 # --- tags ------------------------------------------------------------------------------------
 
 
+def test_a_tag_counts_apart_the_links_on_channels_the_user_still_follows(db, make_user):
+    """An unsubscribe keeps the channel's tag links; the Channels page's filter lists only followed
+    channels, so its count must not hold the others."""
+    user, other = make_user(), make_user()
+    tag = service.create_tag(db, user, "Music", "other", None)
+    for cid in ("UCa", "UCb", "UCgone"):
+        db.add(Channel(id=cid, title=cid))
+    db.flush()
+    for cid in ("UCa", "UCb"):
+        db.add(Subscription(user_id=user.id, channel_id=cid))
+    db.add(Subscription(user_id=other.id, channel_id="UCgone"))
+    for cid in ("UCa", "UCb", "UCgone"):
+        db.add(ChannelTag(channel_id=cid, tag_id=tag.id, user_id=user.id, source="user"))
+    db.commit()
+    [(_, count, subscribed)] = [r for r in queries.tags_with_counts(db, user) if r[0].id == tag.id]
+    assert (count, subscribed) == (3, 2)
+
+
 def test_a_tag_is_made_once_per_name_and_an_unknown_category_is_other(db, make_user):
     user = make_user()
     tag = service.create_tag(db, user, "Later", "nonsense", "#fff")

backend/tests/test_share_paths.py

@@ -135,3 +135,14 @@ def test_a_card_of_a_video_stays_a_video(shared, db):
     assert f"/watch/{made['token']}" in tags and "video.other" in tags
     locked = shared("other.mp4", _VIDEO, password="pw")
     assert "Password-protected video" in og._watch_tags(locked["token"], db)
+
+
+@pytest.mark.parametrize(
+    ("name", "data", "video"),
+    [("clip.mp4", _VIDEO, True), ("song.m4a", _AUDIO, False), ("backup.tar.gz", None, False)],
+)
+def test_a_password_link_says_whether_it_opens_a_video(shared, client, name, data, video):
+    """The lock screen asks to watch a video and to open anything else, whichever path it is on."""
+    token = shared(name, data, password="pw")["token"]
+    meta = client.get(f"/api/public/watch/{token}").json()
+    assert meta == {"needs_password": True, "kind": "file", "video": video}