Merge uid_cache.bin and global_script_class_cache.cfg after mounting PCKs

fixes godotengine#82061
fixes godotengine#61556

Also, distinguish between main pack and DLC packs.
It's desirable to downloaded content to be as small as possible. This change avoids bloating non-main pack files with new versions of resources that are all read on startup and never used again. They have no effect if loaded after startup.
- project.godot/project.binary file
- extension_list.cfg
- app icon and boot_splash
- .ico and .icns files (these can still be opted in for DLC by listing them explicitly in the include filter)

1 files changed, 18 insertions, 6 deletions

diff --git a/core/object/script_language.cpp b/core/object/script_language.cpp
index d358a8d2a0..5885cf515f 100644
--- a/core/object/script_language.cpp
+++ b/core/object/script_language.cpp
@@ -325,12 +325,24 @@ void ScriptServer::global_classes_clear() {
 
 void ScriptServer::add_global_class(const StringName &p_class, const StringName &p_base, const StringName &p_language, const String &p_path) {
 	ERR_FAIL_COND_MSG(p_class == p_base || (global_classes.has(p_base) && get_global_class_native_base(p_base) == p_class), "Cyclic inheritance in script class.");
-	GlobalScriptClass g;
-	g.language = p_language;
-	g.path = p_path;
-	g.base = p_base;
-	global_classes[p_class] = g;
-	inheriters_cache_dirty = true;
+	GlobalScriptClass *existing = global_classes.getptr(p_class);
+	if (existing) {
+		// Update an existing class (only set dirty if something changed).
+		if (existing->base != p_base || existing->path != p_path || existing->language != p_language) {
+			existing->base = p_base;
+			existing->path = p_path;
+			existing->language = p_language;
+			inheriters_cache_dirty = true;
+		}
+	} else {
+		// Add new class.
+		GlobalScriptClass g;
+		g.language = p_language;
+		g.path = p_path;
+		g.base = p_base;
+		global_classes[p_class] = g;
+		inheriters_cache_dirty = true;
+	}
 }
 
 void ScriptServer::remove_global_class(const StringName &p_class) {