Fix icon UIDs in Project Manager

core/io/resource_uid.cpp

@@ -229,7 +229,7 @@ Error ResourceUID::load_from_cache(bool p_reset) {
 		int32_t len = f->get_32();
 		Cache c;
 		c.cs.resize(len + 1);
-		ERR_FAIL_COND_V(c.cs.size() != len + 1, ERR_FILE_CORRUPT); // out of memory
+		ERR_FAIL_COND_V(c.cs.size() != len + 1, ERR_FILE_CORRUPT); // Out of memory.
 		c.cs[len] = 0;
 		int32_t rl = f->get_buffer((uint8_t *)c.cs.ptrw(), len);
 		ERR_FAIL_COND_V(rl != len, ERR_FILE_CORRUPT);
@@ -257,7 +257,7 @@ Error ResourceUID::update_cache() {
 	for (KeyValue<ID, Cache> &E : unique_ids) {
 		if (!E.value.saved_to_cache) {
 			if (f.is_null()) {
-				f = FileAccess::open(get_cache_file(), FileAccess::READ_WRITE); //append
+				f = FileAccess::open(get_cache_file(), FileAccess::READ_WRITE); // Append.
 				if (f.is_null()) {
 					return ERR_CANT_OPEN;
 				}
@@ -282,6 +282,25 @@ Error ResourceUID::update_cache() {
 	return OK;
 }
 
+String ResourceUID::get_path_from_cache(Ref<FileAccess> &p_cache_file, const String &p_uid_string) {
+	const uint32_t entry_count = p_cache_file->get_32();
+	CharString cs;
+	for (uint32_t i = 0; i < entry_count; i++) {
+		int64_t id = p_cache_file->get_64();
+		int32_t len = p_cache_file->get_32();
+		cs.resize(len + 1);
+		ERR_FAIL_COND_V(cs.size() != len + 1, String());
+		cs[len] = 0;
+		int32_t rl = p_cache_file->get_buffer((uint8_t *)cs.ptrw(), len);
+		ERR_FAIL_COND_V(rl != len, String());
+
+		if (singleton->id_to_text(id) == p_uid_string) {
+			return String(cs);
+		}
+	}
+	return String();
+}
+
 void ResourceUID::clear() {
 	cache_entries = 0;
 	unique_ids.clear();

core/io/resource_uid.h

@@ -35,6 +35,8 @@
 #include "core/string/string_name.h"
 #include "core/templates/hash_map.h"
 
+class FileAccess;
+
 class ResourceUID : public Object {
 	GDCLASS(ResourceUID, Object)
 public:
@@ -78,6 +80,7 @@ public:
 	Error load_from_cache(bool p_reset);
 	Error save_to_cache();
 	Error update_cache();
+	static String get_path_from_cache(Ref<FileAccess> &p_cache_file, const String &p_uid_string);
 
 	void clear();
 

editor/project_manager/project_list.cpp

@@ -489,9 +489,20 @@ ProjectList::Item ProjectList::load_project_data(const String &p_path, bool p_fa
 
 	const String description = cf->get_value("application", "config/description", "");
 	const PackedStringArray tags = cf->get_value("application", "config/tags", PackedStringArray());
-	const String icon = cf->get_value("application", "config/icon", "");
 	const String main_scene = cf->get_value("application", "run/main_scene", "");
 
+	String icon = cf->get_value("application", "config/icon", "");
+	if (icon.begins_with("uid://")) {
+		Error err;
+		Ref<FileAccess> file = FileAccess::open(p_path.path_join(".godot/uid_cache.bin"), FileAccess::READ, &err);
+		if (err == OK) {
+			icon = ResourceUID::get_path_from_cache(file, icon);
+			if (icon.is_empty()) {
+				WARN_PRINT(vformat("Could not load icon from UID for project at path \"%s\". Make sure UID cache exists.", p_path));
+			}
+		}
+	}
+
 	PackedStringArray project_features = cf->get_value("application", "config/features", PackedStringArray());
 	PackedStringArray unsupported_features = ProjectSettings::get_unsupported_features(project_features);