TOOLS/autocrop.lua: improve enable/disable condition

The previous code tried to disable autocrop for cover-art by testing
that track-list/$vid/albumart is false, however, $vid is completely
unrelated to the track-list index.

It only sometimes succeeded to disable for albumart, by accident,
e.g. with one audio track and one video track where $vid==1 and
track-list/1 happens to be the video (cover art) track.

The new code detects the currently-used video track by finding a track
with type=="video" and selected==true. Unlike the previous code, it
also works in scenarios with many audio/video/sub tracks.

Additionally, autocrop is now enabled also with lavfi-complex, which
should be considered an improvement. The previous code implicitly
disabled it with lavfi-complex because $vid is nil on such case.

1 files changed, 6 insertions, 5 deletions

diff --git a/TOOLS/lua/autocrop.lua b/TOOLS/lua/autocrop.lua
index af6021b75a..a06db7f702 100644
--- a/TOOLS/lua/autocrop.lua
+++ b/TOOLS/lua/autocrop.lua
@@ -102,12 +102,13 @@ function is_enough_time(seconds)
 end
 
 function is_cropable()
-    local vid = mp.get_property_native("vid")
-    local is_album = vid and mp.get_property_native(
-        string.format("track-list/%d/albumart", vid)
-    ) or false
+    for _, track in pairs(mp.get_property_native('track-list')) do
+        if track.type == 'video' and track.selected then
+            return not track.albumart
+        end
+    end
 
-    return vid and not is_album
+    return false
 end
 
 function remove_filter(label)