Add MIME argument to the FileDialog.add_filter.

doc/classes/DisplayServer.xml

@@ -784,7 +784,7 @@
 				Callbacks have the following arguments: [code]status: bool, selected_paths: PackedStringArray, selected_filter_index: int[/code]. [b]On Android,[/b] the third callback argument ([code]selected_filter_index[/code]) is always [code]0[/code].
 				[b]Note:[/b] This method is implemented if the display server has the [constant FEATURE_NATIVE_DIALOG_FILE] feature. Supported platforms include Linux (X11/Wayland), Windows, macOS, and Android (API level 29+).
 				[b]Note:[/b] [param current_directory] might be ignored.
-				[b]Note:[/b] Embedded file dialog and Windows file dialog support only file extensions, while Android, Linux, and macOS file dialogs also support MIME types.
+				[b]Note:[/b] Embedded file dialogs and Windows file dialogs support only file extensions, while Android, Linux, and macOS file dialogs also support MIME types.
 				[b]Note:[/b] On Android and Linux, [param show_hidden] is ignored.
 				[b]Note:[/b] On Android and macOS, native file dialogs have no title.
 				[b]Note:[/b] On macOS, sandboxed apps will save security-scoped bookmarks to retain access to the opened folders across multiple sessions. Use [method OS.get_granted_permissions] to get a list of saved bookmarks.
@@ -812,7 +812,7 @@
 				Callbacks have the following arguments: [code]status: bool, selected_paths: PackedStringArray, selected_filter_index: int, selected_option: Dictionary[/code].
 				[b]Note:[/b] This method is implemented if the display server has the [constant FEATURE_NATIVE_DIALOG_FILE_EXTRA] feature. Supported platforms include Linux (X11/Wayland), Windows, and macOS.
 				[b]Note:[/b] [param current_directory] might be ignored.
-				[b]Note:[/b] Embedded file dialog and Windows file dialog support only file extensions, while Android, Linux, and macOS file dialogs also support MIME types.
+				[b]Note:[/b] Embedded file dialogs and Windows file dialogs support only file extensions, while Android, Linux, and macOS file dialogs also support MIME types.
 				[b]Note:[/b] On Linux (X11), [param show_hidden] is ignored.
 				[b]Note:[/b] On macOS, native file dialogs have no title.
 				[b]Note:[/b] On macOS, sandboxed apps will save security-scoped bookmarks to retain access to the opened folders across multiple sessions. Use [method OS.get_granted_permissions] to get a list of saved bookmarks.

doc/classes/FileDialog.xml

@@ -13,10 +13,12 @@
 			<return type="void" />
 			<param index="0" name="filter" type="String" />
 			<param index="1" name="description" type="String" default="&quot;&quot;" />
+			<param index="2" name="mime_type" type="String" default="&quot;&quot;" />
 			<description>
-				Adds a comma-separated file name [param filter] option to the [FileDialog] with an optional [param description], which restricts what files can be picked.
+				Adds a comma-separated file extension [param filter] and comma-separated MIME type [param mime_type] option to the [FileDialog] with an optional [param description], which restricts what files can be picked.
 				A [param filter] should be of the form [code]"filename.extension"[/code], where filename and extension can be [code]*[/code] to match any string. Filters starting with [code].[/code] (i.e. empty filenames) are not allowed.
-				For example, a [param filter] of [code]"*.png, *.jpg"[/code] and a [param description] of [code]"Images"[/code] results in filter text "Images (*.png, *.jpg)".
+				For example, a [param filter] of [code]"*.png, *.jpg"[/code], a [param mime_type] of [code]image/png, image/jpeg[/code], and a [param description] of [code]"Images"[/code] results in filter text "Images (*.png, *.jpg)".
+				[b]Note:[/b] Embedded file dialogs and Windows file dialogs support only file extensions, while Android, Linux, and macOS file dialogs also support MIME types.
 			</description>
 		</method>
 		<method name="add_option">
@@ -232,7 +234,7 @@
 		</member>
 		<member name="filters" type="PackedStringArray" setter="set_filters" getter="get_filters" default="PackedStringArray()">
 			The available file type filters. Each filter string in the array should be formatted like this: [code]*.png,*.jpg,*.jpeg;Image Files;image/png,image/jpeg[/code]. The description text of the filter is optional and can be omitted. Both file extensions and MIME type should be always set.
-			[b]Note:[/b] Embedded file dialog and Windows file dialog support only file extensions, while Android, Linux, and macOS file dialogs also support MIME types.
+			[b]Note:[/b] Embedded file dialogs and Windows file dialogs support only file extensions, while Android, Linux, and macOS file dialogs also support MIME types.
 		</member>
 		<member name="folder_creation_enabled" type="bool" setter="set_customization_flag_enabled" getter="is_customization_flag_enabled" default="true">
 			If [code]true[/code], shows the button for creating new directories (when using [constant FILE_MODE_OPEN_DIR], [constant FILE_MODE_OPEN_ANY], or [constant FILE_MODE_SAVE_FILE]), and the context menu will have the "New Folder..." option.

misc/extension_api_validation/4.5-stable.expected

@@ -54,3 +54,10 @@ Validate extension JSON: Error: Field 'classes/AnimationPlayer/methods/set_curre
 Validate extension JSON: Error: Field 'classes/AnimationPlayer/signals/current_animation_changed/arguments/0': type changed value in new API, from "String" to "StringName".
 
 Return types and parameters changed to StringName to improve performance. Compatibility methods registered; No compatibility system for signal arguments.
+
+
+GH-111439
+---------
+Validate extension JSON: Error: Field 'classes/FileDialog/methods/add_filter/arguments': size changed value in new API, from 2 to 3.
+
+Optional argument added. Compatibility method registered.

scene/gui/file_dialog.compat.inc

@@ -0,0 +1,41 @@
+/**************************************************************************/
+/*  file_dialog.compat.inc                                                */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#ifndef DISABLE_DEPRECATED
+
+void FileDialog::_add_filter_bind_compat_111439(const String &p_filter, const String &p_description) {
+	add_filter(p_filter, p_description, "");
+}
+
+void FileDialog::_bind_compatibility_methods() {
+	ClassDB::bind_compatibility_method(D_METHOD("add_filter", "filter", "description"), &FileDialog::_add_filter_bind_compat_111439, DEFVAL(""));
+}
+
+#endif

scene/gui/file_dialog.cpp

@@ -29,6 +29,7 @@
 /**************************************************************************/
 
 #include "file_dialog.h"
+#include "file_dialog.compat.inc"
 
 #include "core/config/project_settings.h"
 #include "core/io/dir_access.h"
@@ -1247,12 +1248,14 @@ void FileDialog::clear_filters() {
 	invalidate();
 }
 
-void FileDialog::add_filter(const String &p_filter, const String &p_description) {
+void FileDialog::add_filter(const String &p_filter, const String &p_description, const String &p_mime) {
 	ERR_FAIL_COND_MSG(p_filter.begins_with("."), "Filter must be \"filename.extension\", can't start with dot.");
-	if (p_description.is_empty()) {
+	if (p_description.is_empty() && p_mime.is_empty()) {
 		filters.push_back(p_filter);
-	} else {
+	} else if (p_mime.is_empty()) {
 		filters.push_back(vformat("%s ; %s", p_filter, p_description));
+	} else {
+		filters.push_back(vformat("%s ; %s ; %s", p_filter, p_description, p_mime));
 	}
 	update_filters();
 	invalidate();
@@ -2035,7 +2038,7 @@ void FileDialog::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_cancel_pressed"), &FileDialog::_cancel_pressed);
 
 	ClassDB::bind_method(D_METHOD("clear_filters"), &FileDialog::clear_filters);
-	ClassDB::bind_method(D_METHOD("add_filter", "filter", "description"), &FileDialog::add_filter, DEFVAL(""));
+	ClassDB::bind_method(D_METHOD("add_filter", "filter", "description", "mime_type"), &FileDialog::add_filter, DEFVAL(""), DEFVAL(""));
 	ClassDB::bind_method(D_METHOD("set_filters", "filters"), &FileDialog::set_filters);
 	ClassDB::bind_method(D_METHOD("get_filters"), &FileDialog::get_filters);
 	ClassDB::bind_method(D_METHOD("clear_filename_filter"), &FileDialog::clear_filename_filter);

scene/gui/file_dialog.h

@@ -370,13 +370,19 @@ class FileDialog : public ConfirmationDialog {
 	bool _property_get_revert(const StringName &p_name, Variant &r_property) const { return property_helper.property_get_revert(p_name, r_property); }
 	static void _bind_methods();
 
+#ifndef DISABLE_DEPRECATED
+	void _add_filter_bind_compat_111439(const String &p_filter, const String &p_description = "");
+
+	static void _bind_compatibility_methods();
+#endif
+
 public:
 	virtual void set_visible(bool p_visible) override;
 	virtual void popup(const Rect2i &p_rect = Rect2i()) override;
 
 	void popup_file_dialog();
 	void clear_filters();
-	void add_filter(const String &p_filter, const String &p_description = "");
+	void add_filter(const String &p_filter, const String &p_description = "", const String &p_mime = "");
 	void set_filters(const Vector<String> &p_filters);
 	Vector<String> get_filters() const;
 	void clear_filename_filter();