Add an editor setting for the GridMap grid color

The opacity can be adjusted by changing the alpha channel of the color
setting. The setting applies without having to restart the editor.

doc/classes/EditorSettings.xml

@@ -432,6 +432,9 @@
 		<member name="editors/3d_gizmos/gizmo_colors/fog_volume" type="Color" setter="" getter="">
 			The 3D editor gizmo color for [FogVolume] nodes.
 		</member>
+		<member name="editors/3d_gizmos/gizmo_colors/gridmap_grid" type="Color" setter="" getter="">
+			The 3D editor gizmo color for the [GridMap] grid.
+		</member>
 		<member name="editors/3d_gizmos/gizmo_colors/instantiated" type="Color" setter="" getter="">
 			The color override to use for 3D editor gizmos if the [Node3D] in question is part of an instantiated scene file (from the perspective of the current scene).
 		</member>

editor/editor_property_name_processor.cpp

@@ -202,6 +202,7 @@ EditorPropertyNameProcessor::EditorPropertyNameProcessor() {
 	capitalize_string_remaps["gles2"] = "GLES2";
 	capitalize_string_remaps["gles3"] = "GLES3";
 	capitalize_string_remaps["gltf"] = "glTF";
+	capitalize_string_remaps["gridmap"] = "GridMap";
 	capitalize_string_remaps["gpu"] = "GPU";
 	capitalize_string_remaps["gui"] = "GUI";
 	capitalize_string_remaps["guid"] = "GUID";

editor/editor_settings.cpp

@@ -793,6 +793,7 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	EDITOR_SETTING_USAGE(Variant::COLOR, PROPERTY_HINT_NONE, "editors/3d_gizmos/gizmo_colors/skeleton", Color(1, 0.8, 0.4), "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED)
 	EDITOR_SETTING_USAGE(Variant::COLOR, PROPERTY_HINT_NONE, "editors/3d_gizmos/gizmo_colors/selected_bone", Color(0.8, 0.3, 0.0), "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED)
 	EDITOR_SETTING_USAGE(Variant::COLOR, PROPERTY_HINT_NONE, "editors/3d_gizmos/gizmo_colors/csg", Color(0.0, 0.4, 1, 0.15), "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED)
+	EDITOR_SETTING(Variant::COLOR, PROPERTY_HINT_NONE, "editors/3d_gizmos/gizmo_colors/gridmap_grid", Color(0.8, 0.5, 0.1), "")
 	_initial_set("editors/3d_gizmos/gizmo_settings/bone_axis_length", (float)0.1);
 	EDITOR_SETTING(Variant::INT, PROPERTY_HINT_ENUM, "editors/3d_gizmos/gizmo_settings/bone_shape", 1, "Wire,Octahedron");
 	EDITOR_SETTING_USAGE(Variant::FLOAT, PROPERTY_HINT_NONE, "editors/3d_gizmos/gizmo_settings/path3d_tilt_disk_size", 0.8, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED)

modules/gridmap/editor/grid_map_editor_plugin.cpp

@@ -1251,6 +1251,10 @@ void GridMapEditor::_notification(int p_what) {
 				forward_spatial_input_event(nullptr, release);
 			}
 		} break;
+
+		case EditorSettings::NOTIFICATION_EDITOR_SETTINGS_CHANGED: {
+			indicator_mat->set_albedo(EDITOR_GET("editors/3d_gizmos/gizmo_colors/gridmap_grid"));
+		} break;
 	}
 }
 
@@ -1713,7 +1717,7 @@ GridMapEditor::GridMapEditor() {
 	indicator_mat->set_flag(StandardMaterial3D::FLAG_SRGB_VERTEX_COLOR, true);
 	indicator_mat->set_flag(StandardMaterial3D::FLAG_ALBEDO_FROM_VERTEX_COLOR, true);
 	indicator_mat->set_flag(StandardMaterial3D::FLAG_DISABLE_FOG, true);
-	indicator_mat->set_albedo(Color(0.8, 0.5, 0.1));
+	indicator_mat->set_albedo(EDITOR_GET("editors/3d_gizmos/gizmo_colors/gridmap_grid"));
 }
 
 GridMapEditor::~GridMapEditor() {