[macOS] Prefer user specified file extensions over OS preferred one.

platform/macos/display_server_macos.mm

@@ -1060,7 +1060,7 @@ Error DisplayServerMacOS::_file_dialog_with_options_show(const String &p_title,
 				Vector<String> files;
 				String url;
 				url.append_utf8([[[panel URL] path] UTF8String]);
-				files.push_back(url);
+				files.push_back([panel_delegate validateFilename:url]);
 				if (callback.is_valid()) {
 					if (p_options_in_cb) {
 						Variant v_result = true;
@@ -1179,7 +1179,7 @@ Error DisplayServerMacOS::_file_dialog_with_options_show(const String &p_title,
 				for (NSUInteger i = 0; i != [urls count]; ++i) {
 					String url;
 					url.append_utf8([[[urls objectAtIndex:i] path] UTF8String]);
-					files.push_back(url);
+					files.push_back([panel_delegate validateFilename:url]);
 				}
 				if (callback.is_valid()) {
 					if (p_options_in_cb) {

platform/macos/godot_open_save_delegate.h

@@ -41,6 +41,7 @@
 @interface GodotOpenSaveDelegate : NSObject <NSOpenSavePanelDelegate> {
 	NSSavePanel *dialog;
 	NSMutableArray *allowed_types;
+	Vector<Vector<String>> preferred_types;
 
 	HashMap<int, String> ctr_ids;
 	Dictionary options;
@@ -51,7 +52,7 @@
 }
 
 - (void)makeAccessoryView:(NSSavePanel *)p_panel filters:(const Vector<String> &)p_filters options:(const TypedArray<Dictionary> &)p_options;
-- (void)setFileTypes:(NSMutableArray *)p_allowed_types;
+- (void)setFileTypes:(NSMutableArray *)p_allowed_types pref:(const Vector<Vector<String>> &)p_preftypes;
 - (void)popupOptionAction:(id)p_sender;
 - (void)popupCheckAction:(id)p_sender;
 - (void)popupFileAction:(id)p_sender;
@@ -60,5 +61,6 @@
 - (int)setDefaultInt:(const String &)p_name value:(int)p_value;
 - (int)setDefaultBool:(const String &)p_name value:(bool)p_value;
 - (void)setRootPath:(const String &)p_root_path;
+- (String)validateFilename:(const String &)p_path;
 
 @end

platform/macos/godot_open_save_delegate.mm

@@ -103,6 +103,7 @@
 	}
 
 	NSMutableArray *new_allowed_types = [[NSMutableArray alloc] init];
+	Vector<Vector<String>> pref_types;
 	bool has_type_popup = false;
 	{
 		NSTextField *label = [NSTextField labelWithString:[NSString stringWithUTF8String:RTR("Format").utf8().get_data()]];
@@ -117,6 +118,7 @@
 			NSPopUpButton *popup = [[NSPopUpButton alloc] initWithFrame:NSZeroRect pullsDown:NO];
 			for (int i = 0; i < p_filters.size(); i++) {
 				Vector<String> tokens = p_filters[i].split(";");
+				Vector<String> pref_type;
 				if (tokens.size() >= 1) {
 					String flt = tokens[0].strip_edges();
 					String mime = (tokens.size() >= 3) ? tokens[2].strip_edges() : String();
@@ -135,9 +137,11 @@
 								}
 								if (ut) {
 									[type_filters addObject:ut];
+									pref_type.push_back(str.replace("*.", "").strip_edges());
 								}
 							} else {
 								[type_filters addObject:[NSString stringWithUTF8String:str.replace("*.", "").strip_edges().utf8().get_data()]];
+								pref_type.push_back(str.replace("*.", "").strip_edges());
 							}
 						}
 					}
@@ -158,6 +162,7 @@
 					if ([type_filters count] > 0) {
 						NSString *name_str = [NSString stringWithUTF8String:((tokens.size() == 1) ? tokens[0] : tokens[1].strip_edges()).utf8().get_data()];
 						[new_allowed_types addObject:type_filters];
+						pref_types.push_back(pref_type);
 						[popup addItemWithTitle:name_str];
 					}
 				}
@@ -171,6 +176,7 @@
 			}
 		} else if (p_filters.size() == 1) {
 			Vector<String> tokens = p_filters[0].split(";");
+			Vector<String> pref_type;
 			if (tokens.size() >= 1) {
 				String flt = tokens[0].strip_edges();
 				String mime = (tokens.size() >= 3) ? tokens[2] : String();
@@ -189,9 +195,11 @@
 							}
 							if (ut) {
 								[type_filters addObject:ut];
+								pref_type.push_back(str.replace("*.", "").strip_edges());
 							}
 						} else {
 							[type_filters addObject:[NSString stringWithUTF8String:str.replace("*.", "").strip_edges().utf8().get_data()]];
+							pref_type.push_back(str.replace("*.", "").strip_edges());
 						}
 					}
 				}
@@ -210,10 +218,11 @@
 
 				if ([type_filters count] > 0) {
 					[new_allowed_types addObject:type_filters];
+					pref_types.push_back(pref_type);
 				}
 			}
 		}
-		[self setFileTypes:new_allowed_types];
+		[self setFileTypes:new_allowed_types pref:pref_types];
 	}
 
 	[base_view addSubview:view];
@@ -278,8 +287,9 @@
 	return cid;
 }
 
-- (void)setFileTypes:(NSMutableArray *)p_allowed_types {
+- (void)setFileTypes:(NSMutableArray *)p_allowed_types pref:(const Vector<Vector<String>> &)p_preftypes {
 	allowed_types = p_allowed_types;
+	preferred_types = p_preftypes;
 }
 
 - (instancetype)initWithDialog:(NSSavePanel *)p_dialog {
@@ -346,6 +356,21 @@
 	root = p_root_path;
 }
 
+- (String)validateFilename:(const String &)p_path {
+	if (@available(macOS 11, *)) {
+		if (allowed_types) {
+			NSMutableArray *type_filters = [allowed_types objectAtIndex:cur_index];
+			UTType *ut = [type_filters objectAtIndex:0];
+			String ext = String::utf8([[ut preferredFilenameExtension] UTF8String]);
+			Vector<String> pref_ext = preferred_types[cur_index];
+			if (!pref_ext.is_empty() && !pref_ext.has(ext) && p_path.has_extension(ext)) {
+				return p_path.get_basename() + "." + pref_ext[0];
+			}
+		}
+	}
+	return p_path;
+}
+
 - (BOOL)panel:(id)sender validateURL:(NSURL *)url error:(NSError *_Nullable *)outError {
 	if (root.is_empty()) {
 		return YES;