On MacOS, filesystem docker won't refresh upon filesystem changes if project is located on an ExFAT drive

[sogon-human]

Tested versions

• Tested in current latest stable release (4.4.1) and dev (4.5dev4) (vanilla godot)

System information

Godot v4.5.dev4 - macOS Sequoia (15.5.0) - Multi-window, 2 monitors - Metal (Forward+) - integrated Apple M1 (Apple7) - Apple M1 (8 threads)

Issue description

I have godot projects that I put in an external drive, because of the very limited internal drive capacity of my machine has. This drive is formatted as ExFAT, as opposed to APFS, because I have to keep it compatible with a windows machine I have. The filesystem docker is supposed to automatically refresh itself if something's changed inside project directory, e.g. new files, removal of files, etc, even though that changes are coming from outside the editor, e.g. creating new files from Finder. However this never happens in real life, I have to reload the current project to have new changes to the filesystem show up within the editor.

Steps to reproduce

• Have an ExFAT-formatted drive connected on a MacOS computer
• Create a new godot project on this drive.
• The godot editor should launches. When the godot editor runs, create a new file inside the project directory from outside the editor, e.g. with terminal: touch my_awesome_text.txt
• Back to the editor, notice that my_awesome_text.txt isn't immediately fetched in filesystem docker.

Having the project inside ExFAT drive is important because this issue doesn't exist if the project is within APFS/HFS+-formatted drive e.g. the built-in mac drive.

Minimal reproduction project (MRP)

Fresh new godot project should be sufficient

[sogon-human]

I think this line of code should be relevant:

godot/editor/editor_file_system.cpp

Line 1406 in 09fcbb8

if (current_mtime != p_dir->modified_time || using_fat32_or_exfat) {

I suspect this line always fails in my system, hence the change detection is thwarted. For some reason, in ExFAT drives, mac does not update modified time of the parent directory if any of its descendant item is updated; only the item itself get updated. I tried to run stat <godot project dir> and it will always report that st_mtime == st_ctime, and because I think modified_time is sourced from this, this current_mtime != p_dir->modified_time check will always be false

Regarding the second check, it appears that it uses get_filesystem_type, which i guess the implementation on macos should be these lines:

godot/drivers/unix/dir_access_unix.cpp

Lines 518 to 520 in 09fcbb8

	String DirAccessUnix::get_filesystem_type() const {
	return ""; //TODO this should be implemented
	}

and it looks like it's still marked as todo.