Fixed enum autocompletion for core classes (Issue godotengine#88858)

Minor fix consisted in the use of [[fallthrough]] macro

Author: dcaoc03

modules/gdscript/gdscript_editor.cpp

@@ -651,6 +651,21 @@ static int _get_enum_constant_location(const StringName &p_class, const StringNa
 	return depth | ScriptLanguage::LOCATION_PARENT_MASK;
 }
 
+static int _get_enum_location(const StringName &p_class, const StringName &p_enum) {
+	if (!ClassDB::has_enum(p_class, p_enum)) {
+		return ScriptLanguage::LOCATION_OTHER;
+	}
+
+	int depth = 0;
+	StringName class_test = p_class;
+	while (class_test && !ClassDB::has_enum(class_test, p_enum, true)) {
+		class_test = ClassDB::get_parent_class(class_test);
+		depth++;
+	}
+
+	return depth | ScriptLanguage::LOCATION_PARENT_MASK;
+}
+
 // END LOCATION METHODS
 
 static String _trim_parent_class(const String &p_class, const String &p_base_class) {
@@ -1198,13 +1213,15 @@ static void _find_identifiers_in_base(const GDScriptCompletionIdentifier &p_base
 					return;
 				}
 
+				List<StringName> enums;
+				ClassDB::get_enum_list(type, &enums);
+				for (const StringName &E : enums) {
+					int location = p_recursion_depth + _get_enum_location(type, E);
+					ScriptLanguage::CodeCompletionOption option(E, ScriptLanguage::CODE_COMPLETION_KIND_ENUM, location);
+					r_result.insert(option.display, option);
+				}
+
 				if (p_types_only) {
-					List<StringName> enums;
-					ClassDB::get_enum_list(type, &enums);
-					for (const StringName &E : enums) {
-						ScriptLanguage::CodeCompletionOption option(E, ScriptLanguage::CODE_COMPLETION_KIND_ENUM);
-						r_result.insert(option.display, option);
-					}
 					return;
 				}
 
@@ -1264,7 +1281,20 @@ static void _find_identifiers_in_base(const GDScriptCompletionIdentifier &p_base
 				}
 				return;
 			} break;
-			case GDScriptParser::DataType::ENUM:
+			case GDScriptParser::DataType::ENUM: {
+				String type_str = base_type.native_type;
+				StringName type = type_str.get_slicec('.', 0);
+				StringName type_enum = base_type.enum_type;
+
+				List<StringName> enum_values;
+				ClassDB::get_enum_constants(type, type_enum, &enum_values);
+				for (const StringName &E : enum_values) {
+					int location = p_recursion_depth + _get_enum_constant_location(type, E);
+					ScriptLanguage::CodeCompletionOption option(E, ScriptLanguage::CODE_COMPLETION_KIND_CONSTANT, location);
+					r_result.insert(option.display, option);
+				}
+			}
+				[[fallthrough]];
 			case GDScriptParser::DataType::BUILTIN: {
 				if (p_types_only) {
 					return;

modules/gdscript/tests/scripts/completion/builtin_enum/builtin_enum_autocomplete.cfg

@@ -0,0 +1,9 @@
+[output]
+include=[
+    {"display": "DrawMode",
+     "location": 256},
+    {"display": "Anchor",
+     "location": 257},
+    {"display": "TextureRepeat",
+     "location": 258},
+]

modules/gdscript/tests/scripts/completion/builtin_enum/builtin_enum_autocomplete.gd

@@ -0,0 +1,4 @@
+extends Control
+
+func _ready():
+    var t = BaseButton.➡

modules/gdscript/tests/scripts/completion/builtin_enum/builtin_enum_values_autocompletion.cfg

@@ -0,0 +1,5 @@
+[output]
+include=[
+    {"display": "HEURISTIC_MAX"},
+    {"display": "HEURISTIC_OCTILE"},
+]

modules/gdscript/tests/scripts/completion/builtin_enum/builtin_enum_values_autocompletion.gd

@@ -0,0 +1,4 @@
+extends Control
+
+func _ready():
+    AStarGrid2D.Heuristic.➡