Merge pull request #1106 from eliasx45/upstream/relink-moved-footage

# Conflicts:
#	docs/footage.md

docs/footage.md

@@ -117,6 +117,14 @@ vectors, positions and IDs are never the picture. EXtractoR reads every other la
   masks, and the item stays in the project. The composition lasts as long as the footage, or as
   the longest layer that showed a still or solid. One undo step (`file.replaceWithPrecomp
   {"item"?}`).
+- **Relinking moved files.** `footage.relink {"item": id, "path": …}` points a missing item at
+  its file's new location, keeping its interpretation, and relinks every other missing item that
+  was in the same place relative to it (the whole folder moved, a drive was renamed, a project
+  made on Windows opened on macOS); File ▸ Replace Footage on a missing item does the same. One
+  undo step; `footage.missing` lists what is still missing.
+- **A project moved with its footage** finds it again on open: the footage check that runs after
+  File ▸ Open tries each missing file at the same place under the project's new folder, without
+  marking the project modified.
 - **File ▸ Reload Footage** (Ctrl+Alt+L) reads the files again. A sequence picks up frames
   added to its folder (a render still in progress) and keeps its interpretation.