Improve layout direction/locale automatic selection.

(cherry picked from commit 82d7923c653b6328ba279bd4183b63b69e21edfc)

core/config/project_settings.cpp

@@ -1331,6 +1331,7 @@ ProjectSettings::ProjectSettings() {
 	GLOBAL_DEF_RST(PropertyInfo(Variant::INT, "rendering/occlusion_culling/bvh_build_quality", PROPERTY_HINT_ENUM, "Low,Medium,High"), 2);
 	GLOBAL_DEF(PropertyInfo(Variant::INT, "memory/limits/multithreaded_server/rid_pool_prealloc", PROPERTY_HINT_RANGE, "0,500,1"), 60); // No negative and limit to 500 due to crashes.
 	GLOBAL_DEF_RST("internationalization/rendering/force_right_to_left_layout_direction", false);
+	GLOBAL_DEF_BASIC(PropertyInfo(Variant::INT, "internationalization/rendering/root_node_layout_direction", PROPERTY_HINT_RANGE, "Based on Locale,Left-to-Right,Right-to-Left"), 0);
 
 	GLOBAL_DEF(PropertyInfo(Variant::INT, "gui/timers/incremental_search_max_interval_msec", PROPERTY_HINT_RANGE, "0,10000,1,or_greater"), 2000);
 

core/string/translation.cpp

@@ -712,7 +712,25 @@ String TranslationServer::get_tool_locale() {
 #else
 	{
 #endif
-		return get_locale();
+		// Look for best matching loaded translation.
+		String best_locale = "en";
+		int best_score = 0;
+
+		for (const Ref<Translation> &E : translations) {
+			const Ref<Translation> &t = E;
+			ERR_FAIL_COND_V(t.is_null(), best_locale);
+			String l = t->get_locale();
+
+			int score = compare_locales(locale, l);
+			if (score > 0 && score >= best_score) {
+				best_locale = l;
+				best_score = score;
+				if (score == 10) {
+					break; // Exact match, skip the rest.
+				}
+			}
+		}
+		return best_locale;
 	}
 }
 

doc/classes/ProjectSettings.xml

@@ -1199,7 +1199,10 @@
 			[b]Note:[/b] This property is only read when the project starts. To toggle pseudolocalization at run-time, use [member TranslationServer.pseudolocalization_enabled] instead.
 		</member>
 		<member name="internationalization/rendering/force_right_to_left_layout_direction" type="bool" setter="" getter="" default="false">
-			Force layout direction and text writing direction to RTL for all locales.
+			Force layout direction and text writing direction to RTL for all controls.
+		</member>
+		<member name="internationalization/rendering/root_node_layout_direction" type="int" setter="" getter="" default="0">
+			Root node default layout direction.
 		</member>
 		<member name="internationalization/rendering/text_driver" type="String" setter="" getter="" default="&quot;&quot;">
 			Specifies the [TextServer] to use. If left empty, the default will be used.

scene/gui/control.cpp

@@ -2793,19 +2793,34 @@ bool Control::is_layout_rtl() const {
 	if (data.is_rtl_dirty) {
 		const_cast<Control *>(this)->data.is_rtl_dirty = false;
 		if (data.layout_dir == LAYOUT_DIRECTION_INHERITED) {
-			Window *parent_window = get_parent_window();
-			Control *parent_control = get_parent_control();
-			if (parent_control) {
-				const_cast<Control *>(this)->data.is_rtl = parent_control->is_layout_rtl();
-			} else if (parent_window) {
-				const_cast<Control *>(this)->data.is_rtl = parent_window->is_layout_rtl();
-			} else {
-				if (GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
-					const_cast<Control *>(this)->data.is_rtl = true;
-				} else {
-					String locale = TranslationServer::get_singleton()->get_tool_locale();
-					const_cast<Control *>(this)->data.is_rtl = TS->is_locale_right_to_left(locale);
+			if (GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
+				const_cast<Control *>(this)->data.is_rtl = true;
+				return data.is_rtl;
+			}
+			Node *parent_node = get_parent();
+			while (parent_node) {
+				Control *parent_control = Object::cast_to<Control>(parent_node);
+				if (parent_control) {
+					const_cast<Control *>(this)->data.is_rtl = parent_control->is_layout_rtl();
+					return data.is_rtl;
 				}
+
+				Window *parent_window = Object::cast_to<Window>(parent_node);
+				if (parent_window) {
+					const_cast<Control *>(this)->data.is_rtl = parent_window->is_layout_rtl();
+					return data.is_rtl;
+				}
+				parent_node = parent_node->get_parent();
+			}
+
+			int root_dir = GLOBAL_GET(SNAME("internationalization/rendering/root_node_layout_direction"));
+			if (root_dir == 1) {
+				const_cast<Control *>(this)->data.is_rtl = false;
+			} else if (root_dir == 2) {
+				const_cast<Control *>(this)->data.is_rtl = true;
+			} else {
+				String locale = TranslationServer::get_singleton()->get_tool_locale();
+				const_cast<Control *>(this)->data.is_rtl = TS->is_locale_right_to_left(locale);
 			}
 		} else if (data.layout_dir == LAYOUT_DIRECTION_LOCALE) {
 			if (GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
@@ -3230,7 +3245,7 @@ void Control::_bind_methods() {
 	ADD_GROUP("Layout", "");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "clip_contents"), "set_clip_contents", "is_clipping_contents");
 	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "custom_minimum_size", PROPERTY_HINT_NONE, "suffix:px"), "set_custom_minimum_size", "get_custom_minimum_size");
-	ADD_PROPERTY(PropertyInfo(Variant::INT, "layout_direction", PROPERTY_HINT_ENUM, "Inherited,Locale,Left-to-Right,Right-to-Left"), "set_layout_direction", "get_layout_direction");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "layout_direction", PROPERTY_HINT_ENUM, "Inherited,Based on Locale,Left-to-Right,Right-to-Left"), "set_layout_direction", "get_layout_direction");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "layout_mode", PROPERTY_HINT_ENUM, "Position,Anchors,Container,Uncontrolled", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_INTERNAL), "_set_layout_mode", "_get_layout_mode");
 	ADD_PROPERTY_DEFAULT("layout_mode", LayoutMode::LAYOUT_MODE_POSITION);
 

scene/main/window.cpp

@@ -2116,22 +2116,39 @@ Window::LayoutDirection Window::get_layout_direction() const {
 
 bool Window::is_layout_rtl() const {
 	if (layout_dir == LAYOUT_DIRECTION_INHERITED) {
-		Window *parent_w = Object::cast_to<Window>(get_parent());
-		if (parent_w) {
-			return parent_w->is_layout_rtl();
-		} else {
-			if (GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
-				return true;
+		if (GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
+			return true;
+		}
+		Node *parent_node = get_parent();
+		while (parent_node) {
+			Control *parent_control = Object::cast_to<Control>(parent_node);
+			if (parent_control) {
+				return parent_control->is_layout_rtl();
 			}
+
+			Window *parent_window = Object::cast_to<Window>(parent_node);
+			if (parent_window) {
+				return parent_window->is_layout_rtl();
+			}
+			parent_node = parent_node->get_parent();
+		}
+
+		int root_dir = GLOBAL_GET(SNAME("internationalization/rendering/root_node_layout_direction"));
+		if (root_dir == 1) {
+			return false;
+		} else if (root_dir == 2) {
+			return true;
+		} else {
 			String locale = TranslationServer::get_singleton()->get_tool_locale();
 			return TS->is_locale_right_to_left(locale);
 		}
 	} else if (layout_dir == LAYOUT_DIRECTION_LOCALE) {
 		if (GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
 			return true;
+		} else {
+			String locale = TranslationServer::get_singleton()->get_tool_locale();
+			return TS->is_locale_right_to_left(locale);
 		}
-		String locale = TranslationServer::get_singleton()->get_tool_locale();
-		return TS->is_locale_right_to_left(locale);
 	} else {
 		return (layout_dir == LAYOUT_DIRECTION_RTL);
 	}