Fix race condition when loading multiple File/Asset Browsers at once

When multiple File or Asset Browsers would load at once (e.g. when loading a
file with two File Browsers open) and they would load multiple directories or
.blend files (using the Recursions option in the File Browser or loading an
asset library with multiple .blends), often only one File/Asset Browser would
correctly load all files. Others would be incomplete or entirely empty. That
was because of a race condition, where the directories or .blend files would be
loaded concurrently and the first one that finished would cancel the other
ones. This again happened because they used the job system with the same
"owner", which by design makes all jobs with the same owner cancel as soon as
the first is finished.
Address this by making sure they have different owners. That is, not the scene
anymore, but the filelist the job belongs to. Doesn't make much sense to use
the scene as owner for scene-unrelated file loading anyway.

Steps to reproduce were:
* Open two File Browsers as regular editors.
* In the Display Settings popover, set "Recursions" to 2 or 3 levels.
* Navigate to a directory with plenty of subdirectories in both File Browsers.
* Save the file.
* Reload the file, one of the File Browsers likely has an incomplete file list.

Alternatively, use Asset Browsers and open an asset library containing multiple
.blends.

1 files changed, 3 insertions, 7 deletions

diff --git a/source/blender/editors/include/ED_fileselect.h b/source/blender/editors/include/ED_fileselect.h
index 8118e3c6c69..cff3a8dfa5f 100644
--- a/source/blender/editors/include/ED_fileselect.h
+++ b/source/blender/editors/include/ED_fileselect.h
@@ -136,13 +136,9 @@ void ED_fileselect_layout_tilepos(FileLayout *layout, int tile, int *x, int *y);
 
 void ED_operatormacros_file(void);
 
-void ED_fileselect_clear(struct wmWindowManager *wm,
-                         struct Scene *owner_scene,
-                         struct SpaceFile *sfile);
+void ED_fileselect_clear(struct wmWindowManager *wm, struct SpaceFile *sfile);
 
-void ED_fileselect_exit(struct wmWindowManager *wm,
-                        struct Scene *owner_scene,
-                        struct SpaceFile *sfile);
+void ED_fileselect_exit(struct wmWindowManager *wm, struct SpaceFile *sfile);
 
 bool ED_fileselect_is_asset_browser(const struct SpaceFile *sfile);
 struct ID *ED_fileselect_active_asset_get(const struct SpaceFile *sfile);
@@ -166,7 +162,7 @@ int ED_file_icon(const struct FileDirEntry *file);
 
 void ED_file_read_bookmarks(void);
 
-void ED_file_change_dir_ex(struct bContext *C, struct bScreen *screen, struct ScrArea *area);
+void ED_file_change_dir_ex(struct bContext *C, struct ScrArea *area);
 void ED_file_change_dir(struct bContext *C);
 
 void ED_file_path_button(struct bScreen *screen,