Adds a `scale_gizmo_handles` entry to the `Touchscreen` editor settings

When enabled, this scales the editor icons to improve usability on touchscreen devices.
In addition this commit fixes touch detection for the collision_shape_2d_editor_plugin so it scales with the icons size.

doc/classes/EditorSettings.xml

@@ -540,6 +540,10 @@
 			If [code]true[/code], increases the scrollbar touch area to improve usability on touchscreen devices.
 			[b]Note:[/b] Defaults to [code]true[/code] on touchscreen devices.
 		</member>
+		<member name="interface/touchscreen/scale_gizmo_handles" type="float" setter="" getter="">
+			Specify the multiplier to apply to the scale for the editor gizmo handles to improve usability on touchscreen devices.
+			[b]Note:[/b] Defaults to [code]1[/code] on non-touchscreen devices.
+		</member>
 		<member name="network/debug/remote_host" type="String" setter="" getter="">
 			The address to listen to when starting the remote debugger. This can be set to [code]0.0.0.0[/code] to allow external clients to connect to the remote debugger (instead of restricting the remote debugger to connections from [code]localhost[/code]).
 		</member>

editor/editor_settings.cpp

@@ -374,6 +374,8 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	set_restart_if_changed("interface/touchscreen/enable_long_press_as_right_click", true);
 	_initial_set("interface/touchscreen/enable_pan_and_scale_gestures", has_touchscreen_ui);
 	set_restart_if_changed("interface/touchscreen/enable_pan_and_scale_gestures", true);
+	_initial_set("interface/touchscreen/scale_gizmo_handles", has_touchscreen_ui ? 3 : 1);
+	hints["interface/touchscreen/scale_gizmo_handles"] = PropertyInfo(Variant::REAL, "interface/touchscreen/scale_gizmo_handles", PROPERTY_HINT_RANGE, "1,5,1");
 
 	// Scene tabs
 	_initial_set("interface/scene_tabs/show_thumbnail_on_hover", true);
@@ -620,7 +622,7 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	_initial_set("editors/2d/pan_speed", 20);
 
 	// Polygon editor
-	_initial_set("editors/poly_editor/point_grab_radius", 8);
+	_initial_set("editors/poly_editor/point_grab_radius", has_touchscreen_ui ? 32 : 8);
 	_initial_set("editors/poly_editor/show_previous_outline", true);
 
 	// Animation

editor/editor_themes.cpp

@@ -133,6 +133,27 @@ static Ref<ImageTexture> editor_generate_icon(int p_index, bool p_convert_color,
 #define ADD_CONVERT_COLOR(dictionary, old_color, new_color) dictionary[Color::html(old_color)] = Color::html(new_color)
 #endif
 
+float get_gizmo_handle_scale(const String &gizmo_handle_name = "") {
+	const float scale_gizmo_handles_for_touch = EDITOR_GET("interface/touchscreen/scale_gizmo_handles");
+	if (scale_gizmo_handles_for_touch > 1.0f) {
+		// The names of the icons that require custom scaling.
+		static Set<StringName> gizmo_to_scale;
+		if (gizmo_to_scale.empty()) {
+			gizmo_to_scale.insert("EditorHandle");
+			gizmo_to_scale.insert("EditorHandleAdd");
+			gizmo_to_scale.insert("EditorCurveHandle");
+			gizmo_to_scale.insert("EditorPathSharpHandle");
+			gizmo_to_scale.insert("EditorPathSmoothHandle");
+		}
+
+		if (gizmo_to_scale.has(gizmo_handle_name)) {
+			return EDSCALE * scale_gizmo_handles_for_touch;
+		}
+	}
+
+	return EDSCALE;
+}
+
 void editor_register_and_generate_icons(Ref<Theme> p_theme, bool p_dark_theme = true, int p_thumb_size = 32, bool p_only_thumbs = false) {
 #ifdef MODULE_SVG_ENABLED
 	// The default icon theme is designed to be used for a dark theme.
@@ -256,10 +277,11 @@ void editor_register_and_generate_icons(Ref<Theme> p_theme, bool p_dark_theme =
 	// Generate icons.
 	if (!p_only_thumbs) {
 		for (int i = 0; i < editor_icons_count; i++) {
-			const int is_exception = exceptions.has(editor_icons_names[i]);
-			const Ref<ImageTexture> icon = editor_generate_icon(i, !is_exception);
+			const String &editor_icon_name = editor_icons_names[i];
+			const int is_exception = exceptions.has(editor_icon_name);
+			const Ref<ImageTexture> icon = editor_generate_icon(i, !is_exception, get_gizmo_handle_scale(editor_icon_name));
 
-			p_theme->set_icon(editor_icons_names[i], "EditorIcons", icon);
+			p_theme->set_icon(editor_icon_name, "EditorIcons", icon);
 		}
 	}
 
@@ -306,6 +328,7 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 	String preset = EDITOR_GET("interface/theme/preset");
 
 	bool increase_scrollbar_touch_area = EDITOR_GET("interface/touchscreen/increase_scrollbar_touch_area");
+	const float gizmo_handle_scale = EDITOR_GET("interface/touchscreen/scale_gizmo_handles");
 	bool highlight_tabs = EDITOR_GET("interface/theme/highlight_tabs");
 	int border_size = EDITOR_GET("interface/theme/border_size");
 
@@ -446,11 +469,18 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 	theme->set_constant("scale", "Editor", EDSCALE);
 	theme->set_constant("thumb_size", "Editor", thumb_size);
 	theme->set_constant("dark_theme", "Editor", dark_theme);
+	theme->set_constant("gizmo_handle_scale", "Editor", gizmo_handle_scale);
 
 	//Register icons + font
+	bool keep_old_icons = false;
+	if (p_theme != nullptr) {
+		keep_old_icons = fabs(p_theme->get_constant("scale", "Editor") - EDSCALE) < 0.00001 &&
+				fabs(p_theme->get_constant("gizmo_handle_scale", "Editor") - gizmo_handle_scale) < 0.00001 &&
+				(bool)p_theme->get_constant("dark_theme", "Editor") == dark_theme;
+	}
 
 	// the resolution and the icon color (dark_theme bool) has not changed, so we do not regenerate the icons
-	if (p_theme != nullptr && fabs(p_theme->get_constant("scale", "Editor") - EDSCALE) < 0.00001 && (bool)p_theme->get_constant("dark_theme", "Editor") == dark_theme) {
+	if (keep_old_icons) {
 		// register already generated icons
 		for (int i = 0; i < editor_icons_count; i++) {
 			theme->set_icon(editor_icons_names[i], "EditorIcons", p_theme->get_icon(editor_icons_names[i], "EditorIcons"));

editor/plugins/collision_shape_2d_editor_plugin.cpp

@@ -343,7 +343,7 @@ bool CollisionShape2DEditor::forward_canvas_gui_input(const Ref<InputEvent> &p_e
 		if (mb->get_button_index() == BUTTON_LEFT) {
 			if (mb->is_pressed()) {
 				for (int i = 0; i < handles.size(); i++) {
-					if (xform.xform(handles[i]).distance_to(gpoint) < 8) {
+					if (xform.xform(handles[i]).distance_to(gpoint) < grab_threshold) {
 						edit_handle = i;
 
 						break;
@@ -557,6 +557,10 @@ void CollisionShape2DEditor::_notification(int p_what) {
 		case NOTIFICATION_EXIT_TREE: {
 			get_tree()->disconnect("node_removed", this, "_node_removed");
 		} break;
+
+		case EditorSettings::NOTIFICATION_EDITOR_SETTINGS_CHANGED: {
+			grab_threshold = EDITOR_GET("editors/poly_editor/point_grab_radius");
+		} break;
 	}
 }
 
@@ -594,6 +598,7 @@ CollisionShape2DEditor::CollisionShape2DEditor(EditorNode *p_editor) {
 
 	edit_handle = -1;
 	pressed = false;
+	grab_threshold = EDITOR_GET("editors/poly_editor/point_grab_radius");
 }
 
 void CollisionShape2DEditorPlugin::edit(Object *p_obj) {

editor/plugins/collision_shape_2d_editor_plugin.h

@@ -75,6 +75,7 @@ class CollisionShape2DEditor : public Control {
 	int shape_type;
 	int edit_handle;
 	bool pressed;
+	real_t grab_threshold = 8;
 	Variant original;
 	Transform2D original_transform;
 	Point2 last_point;

editor/plugins/curve_editor_plugin.cpp

@@ -44,6 +44,7 @@ CurveEditor::CurveEditor() {
 	_tangents_length = 40;
 	_dragging = false;
 	_has_undo_data = false;
+	_gizmo_handle_scale = EDITOR_GET("interface/touchscreen/scale_gizmo_handles");
 
 	set_focus_mode(FOCUS_ALL);
 	set_clip_contents(true);
@@ -96,8 +97,13 @@ Size2 CurveEditor::get_minimum_size() const {
 }
 
 void CurveEditor::_notification(int p_what) {
-	if (p_what == NOTIFICATION_DRAW) {
-		_draw();
+	switch (p_what) {
+		case NOTIFICATION_DRAW: {
+			_draw();
+		} break;
+		case EditorSettings::NOTIFICATION_EDITOR_SETTINGS_CHANGED: {
+			_gizmo_handle_scale = EDITOR_GET("interface/touchscreen/scale_gizmo_handles");
+		} break;
 	}
 }
 
@@ -391,7 +397,7 @@ int CurveEditor::get_point_at(Vector2 pos) const {
 	}
 	const Curve &curve = **_curve_ref;
 
-	const float true_hover_radius = Math::round(_hover_radius * EDSCALE);
+	const float true_hover_radius = Math::round(_hover_radius * _gizmo_handle_scale * EDSCALE);
 	const float r = true_hover_radius * true_hover_radius;
 
 	for (int i = 0; i < curve.get_point_count(); ++i) {
@@ -411,14 +417,14 @@ CurveEditor::TangentIndex CurveEditor::get_tangent_at(Vector2 pos) const {
 
 	if (_selected_point != 0) {
 		Vector2 control_pos = get_tangent_view_pos(_selected_point, TANGENT_LEFT);
-		if (control_pos.distance_to(pos) < _hover_radius) {
+		if (control_pos.distance_to(pos) < _hover_radius * _gizmo_handle_scale) {
 			return TANGENT_LEFT;
 		}
 	}
 
 	if (_selected_point != _curve_ref->get_point_count() - 1) {
 		Vector2 control_pos = get_tangent_view_pos(_selected_point, TANGENT_RIGHT);
-		if (control_pos.distance_to(pos) < _hover_radius) {
+		if (control_pos.distance_to(pos) < _hover_radius * _gizmo_handle_scale) {
 			return TANGENT_RIGHT;
 		}
 	}
@@ -555,7 +561,7 @@ Vector2 CurveEditor::get_tangent_view_pos(int i, TangentIndex tangent) const {
 	Vector2 point_pos = get_view_pos(_curve_ref->get_point_position(i));
 	Vector2 control_pos = get_view_pos(_curve_ref->get_point_position(i) + dir);
 
-	return point_pos + Math::round(_tangents_length * EDSCALE) * (control_pos - point_pos).normalized();
+	return point_pos + Math::round(_tangents_length * _gizmo_handle_scale * EDSCALE) * (control_pos - point_pos).normalized();
 }
 
 Vector2 CurveEditor::get_view_pos(Vector2 world_pos) const {
@@ -699,13 +705,13 @@ void CurveEditor::_draw() {
 		if (i != 0) {
 			Vector2 control_pos = get_tangent_view_pos(i, TANGENT_LEFT);
 			draw_line(get_view_pos(pos), control_pos, tangent_color, Math::round(EDSCALE), true);
-			draw_rect(Rect2(control_pos, Vector2(1, 1)).grow(Math::round(2 * EDSCALE)), tangent_color);
+			draw_rect(Rect2(control_pos, Vector2(1, 1)).grow(Math::round(2 * _gizmo_handle_scale * EDSCALE)), tangent_color);
 		}
 
 		if (i != curve.get_point_count() - 1) {
 			Vector2 control_pos = get_tangent_view_pos(i, TANGENT_RIGHT);
 			draw_line(get_view_pos(pos), control_pos, tangent_color, Math::round(EDSCALE), true);
-			draw_rect(Rect2(control_pos, Vector2(1, 1)).grow(Math::round(2 * EDSCALE)), tangent_color);
+			draw_rect(Rect2(control_pos, Vector2(1, 1)).grow(Math::round(2 * _gizmo_handle_scale * EDSCALE)), tangent_color);
 		}
 	}
 
@@ -728,7 +734,7 @@ void CurveEditor::_draw() {
 
 	for (int i = 0; i < curve.get_point_count(); ++i) {
 		Vector2 pos = curve.get_point_position(i);
-		draw_rect(Rect2(get_view_pos(pos), Vector2(1, 1)).grow(Math::round(3 * EDSCALE)), i == _selected_point ? selected_point_color : point_color);
+		draw_rect(Rect2(get_view_pos(pos), Vector2(1, 1)).grow(Math::round(3 * _gizmo_handle_scale * EDSCALE)), i == _selected_point ? selected_point_color : point_color);
 		// TODO Circles are prettier. Needs a fix! Or a texture
 		//draw_circle(pos, 2, point_color);
 	}
@@ -738,7 +744,7 @@ void CurveEditor::_draw() {
 	if (_hover_point != -1) {
 		const Color hover_color = line_color;
 		Vector2 pos = curve.get_point_position(_hover_point);
-		draw_rect(Rect2(get_view_pos(pos), Vector2(1, 1)).grow(Math::round(_hover_radius * EDSCALE)), hover_color, false, Math::round(EDSCALE));
+		draw_rect(Rect2(get_view_pos(pos), Vector2(1, 1)).grow(Math::round(_hover_radius * _gizmo_handle_scale * EDSCALE)), hover_color, false, Math::round(EDSCALE));
 	}
 
 	// Help text

editor/plugins/curve_editor_plugin.h

@@ -117,6 +117,7 @@ private:
 	// Constant
 	float _hover_radius;
 	float _tangents_length;
+	float _gizmo_handle_scale = 1.0;
 };
 
 class EditorInspectorPluginCurve : public EditorInspectorPlugin {