Universalize UID support in all resource types

Ensures all resource types support UIDs in a project.

This is required to fix:
* Scripts and many other resource types can't be referenced by UID and when refactored the references are lost.
* Path export properties can't use UID for unsupported types.
* Refactoring problems when files are moved outside the editor (this PR effectively fixes it).
* Editor properly refreshing paths if they changed externally while opened (as example, git update).
  This needs to be addressed in a subsequent PR, but this one effectively sets the prerequisites.

Resource types that do not support UID will get a .uid file appended to them (this includes .gd, .gdshader, .gdextension, etc. files).

1 files changed, 9 insertions, 0 deletions

diff --git a/editor/editor_file_system.cpp b/editor/editor_file_system.cpp
index 558eed98c6..0c284feb37 100644
--- a/editor/editor_file_system.cpp
+++ b/editor/editor_file_system.cpp
@@ -1259,6 +1259,15 @@ void EditorFileSystem::_process_file_system(const ScannedDirectory *p_scan_dir,
 					}
 				}
 			}
+
+			if (fi->uid == ResourceUID::INVALID_ID && ResourceLoader::exists(path) && !ResourceLoader::has_custom_uid_support(path) && !FileAccess::exists(path + ".uid")) {
+				// Create a UID.
+				Ref<FileAccess> f = FileAccess::open(path + ".uid", FileAccess::WRITE);
+				if (f.is_valid()) {
+					fi->uid = ResourceUID::get_singleton()->create_id();
+					f->store_line(ResourceUID::get_singleton()->id_to_text(fi->uid));
+				}
+			}
 		}
 
 		if (fi->uid != ResourceUID::INVALID_ID) {