Increase the default 3D manipulator gizmo opacity for better visibility

- Brighten gizmos when highlighted to make the difference between a
  non-highlighted and a highlighted gizmo more visible.
- Tweak the manipulator gizmo size property hint.

editor/plugins/node_3d_editor_plugin.cpp

@@ -5228,7 +5228,7 @@ void Node3DEditor::_init_indicators() {
 			gizmo_color[i] = mat;
 
 			Ref<StandardMaterial3D> mat_hl = mat->duplicate();
-			mat_hl->set_albedo(Color(col.r, col.g, col.b, 1.0));
+			mat_hl->set_albedo(Color(col.r * 1.3, col.g * 1.3, col.b * 1.3, 1.0));
 			gizmo_color_hl[i] = mat_hl;
 
 			Vector3 ivec;
@@ -5323,7 +5323,7 @@ void Node3DEditor::_init_indicators() {
 				surftool->commit(move_plane_gizmo[i]);
 
 				Ref<StandardMaterial3D> plane_mat_hl = plane_mat->duplicate();
-				plane_mat_hl->set_albedo(Color(col.r, col.g, col.b, 1.0));
+				plane_mat_hl->set_albedo(Color(col.r * 1.3, col.g * 1.3, col.b * 1.3, 1.0));
 				plane_gizmo_color_hl[i] = plane_mat_hl; // needed, so we can draw planes from both sides
 			}
 
@@ -5406,7 +5406,7 @@ void Node3DEditor::_init_indicators() {
 				rotate_gizmo[i]->surface_set_material(0, rotate_mat);
 
 				Ref<ShaderMaterial> rotate_mat_hl = rotate_mat->duplicate();
-				rotate_mat_hl->set_shader_param("albedo", Color(col.r, col.g, col.b, 1.0));
+				rotate_mat_hl->set_shader_param("albedo", Color(col.r * 1.3, col.g * 1.3, col.b * 1.3, 1.0));
 				rotate_gizmo_color_hl[i] = rotate_mat_hl;
 
 				if (i == 2) { // Rotation white outline
@@ -5533,7 +5533,7 @@ void Node3DEditor::_init_indicators() {
 				surftool->commit(scale_plane_gizmo[i]);
 
 				Ref<StandardMaterial3D> plane_mat_hl = plane_mat->duplicate();
-				plane_mat_hl->set_albedo(Color(col.r, col.g, col.b, 1.0));
+				plane_mat_hl->set_albedo(Color(col.r * 1.3, col.g * 1.3, col.b * 1.3, 1.0));
 				plane_gizmo_color_hl[i] = plane_mat_hl; // needed, so we can draw planes from both sides
 			}
 		}
@@ -6541,8 +6541,8 @@ Node3DEditor::Node3DEditor(EditorNode *p_editor) {
 	add_to_group("_spatial_editor_group");
 
 	EDITOR_DEF("editors/3d/manipulator_gizmo_size", 80);
-	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::INT, "editors/3d/manipulator_gizmo_size", PROPERTY_HINT_RANGE, "16,1024,1"));
-	EDITOR_DEF("editors/3d/manipulator_gizmo_opacity", 0.4);
+	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::INT, "editors/3d/manipulator_gizmo_size", PROPERTY_HINT_RANGE, "16,160,1"));
+	EDITOR_DEF("editors/3d/manipulator_gizmo_opacity", 0.9);
 	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::FLOAT, "editors/3d/manipulator_gizmo_opacity", PROPERTY_HINT_RANGE, "0,1,0.01"));
 	EDITOR_DEF("editors/3d/navigation/show_viewport_rotation_gizmo", true);