[DisplayServer] Add error messages and descriptions to callbacks.

doc/classes/DisplayServer.xml

@@ -63,6 +63,7 @@
 			<param index="2" name="callback" type="Callable" />
 			<description>
 				Creates a new application status indicator with the specified icon, tooltip, and activation callback.
+				[param callback] should take two arguments: the pressed mouse button (one of the [enum MouseButton] constants) and the click position in screen coordinates (a [Vector2i]).
 			</description>
 		</method>
 		<method name="cursor_get_shape" qualifiers="const">
@@ -875,7 +876,7 @@
 			<param index="1" name="open_callback" type="Callable" />
 			<param index="2" name="close_callback" type="Callable" />
 			<description>
-				Registers callables to emit when the menu is respectively about to show or closed.
+				Registers callables to emit when the menu is respectively about to show or closed. Callback methods should have zero arguments.
 			</description>
 		</method>
 		<method name="has_feature" qualifiers="const">
@@ -1187,7 +1188,7 @@
 			<param index="0" name="id" type="int" />
 			<param index="1" name="callback" type="Callable" />
 			<description>
-				Sets the application status indicator activation callback.
+				Sets the application status indicator activation callback. [param callback] should take two arguments: [int] mouse button index (one of [enum MouseButton] values) and [Vector2i] click position in screen coordinates.
 				[b]Note:[/b] This method is implemented on macOS and Windows.
 			</description>
 		</method>
@@ -1568,7 +1569,7 @@
 			<param index="0" name="callback" type="Callable" />
 			<param index="1" name="window_id" type="int" default="0" />
 			<description>
-				Sets the [param callback] that should be called when files are dropped from the operating system's file manager to the window specified by [param window_id].
+				Sets the [param callback] that should be called when files are dropped from the operating system's file manager to the window specified by [param window_id]. [param callback] should take one [PackedStringArray] argument, which is the list of dropped files.
 				[b]Warning:[/b] Advanced users only! Adding such a callback to a [Window] node will override its default implementation, which can introduce bugs.
 				[b]Note:[/b] This method is implemented on Windows, macOS, Linux (X11/Wayland), and Web.
 			</description>

editor/editor_node.cpp

@@ -671,7 +671,7 @@ void EditorNode::_notification(int p_what) {
 
 			callable_mp(this, &EditorNode::_begin_first_scan).call_deferred();
 
-			DisplayServer::get_singleton()->set_system_theme_change_callback(callable_mp(this, &EditorNode::_update_theme));
+			DisplayServer::get_singleton()->set_system_theme_change_callback(callable_mp(this, &EditorNode::_update_theme).bind(false));
 
 			/* DO NOT LOAD SCENES HERE, WAIT FOR FILE SCANNING AND REIMPORT TO COMPLETE */
 		} break;

platform/ios/display_server_ios.mm

@@ -399,7 +399,12 @@ void DisplayServerIOS::set_system_theme_change_callback(const Callable &p_callab
 
 void DisplayServerIOS::emit_system_theme_changed() {
 	if (system_theme_changed.is_valid()) {
-		system_theme_changed.call();
+		Variant ret;
+		Callable::CallError ce;
+		system_theme_changed.callp(nullptr, 0, ret, ce);
+		if (ce.error != Callable::CallError::CALL_OK) {
+			ERR_PRINT(vformat("Failed to execute system theme changed callback: %s.", Variant::get_callable_error_text(system_theme_changed, nullptr, 0, ce)));
+		}
 	}
 }
 

platform/linuxbsd/freedesktop_portal_desktop.cpp

@@ -597,7 +597,12 @@ void FreeDesktopPortalDesktop::_thread_monitor(void *p_ud) {
 
 void FreeDesktopPortalDesktop::_system_theme_changed_callback() {
 	if (system_theme_changed.is_valid()) {
-		system_theme_changed.call();
+		Variant ret;
+		Callable::CallError ce;
+		system_theme_changed.callp(nullptr, 0, ret, ce);
+		if (ce.error != Callable::CallError::CALL_OK) {
+			ERR_PRINT(vformat("Failed to execute system theme changed callback: %s.", Variant::get_callable_error_text(system_theme_changed, nullptr, 0, ce)));
+		}
 	}
 }
 

platform/linuxbsd/wayland/display_server_wayland.cpp

@@ -1137,7 +1137,14 @@ void DisplayServerWayland::process_events() {
 			WindowData wd = main_window;
 
 			if (wd.drop_files_callback.is_valid()) {
-				wd.drop_files_callback.call(dropfiles_msg->files);
+				Variant v_files = dropfiles_msg->files;
+				const Variant *v_args[1] = { &v_files };
+				Variant ret;
+				Callable::CallError ce;
+				wd.drop_files_callback.callp((const Variant **)&v_args, 1, ret, ce);
+				if (ce.error != Callable::CallError::CALL_OK) {
+					ERR_PRINT(vformat("Failed to execute drop files callback: %s.", Variant::get_callable_error_text(wd.drop_files_callback, v_args, 1, ce)));
+				}
 			}
 		}
 	}

platform/linuxbsd/x11/display_server_x11.cpp

@@ -5008,7 +5008,14 @@ void DisplayServerX11::process_events() {
 					}
 
 					if (windows[window_id].drop_files_callback.is_valid()) {
-						windows[window_id].drop_files_callback.call(files);
+						Variant v_files = files;
+						const Variant *v_args[1] = { &v_files };
+						Variant ret;
+						Callable::CallError ce;
+						windows[window_id].drop_files_callback.callp((const Variant **)&v_args, 1, ret, ce);
+						if (ce.error != Callable::CallError::CALL_OK) {
+							ERR_PRINT(vformat("Failed to execute drop files callback: %s.", Variant::get_callable_error_text(windows[window_id].drop_files_callback, v_args, 1, ce)));
+						}
 					}
 
 					//Reply that all is well.

platform/macos/display_server_macos.mm

@@ -907,7 +907,12 @@ void DisplayServerMacOS::set_system_theme_change_callback(const Callable &p_call
 
 void DisplayServerMacOS::emit_system_theme_changed() {
 	if (system_theme_changed.is_valid()) {
-		system_theme_changed.call();
+		Variant ret;
+		Callable::CallError ce;
+		system_theme_changed.callp(nullptr, 0, ret, ce);
+		if (ce.error != Callable::CallError::CALL_OK) {
+			ERR_PRINT(vformat("Failed to execute system theme changed callback: %s.", Variant::get_callable_error_text(system_theme_changed, nullptr, 0, ce)));
+		}
 	}
 }
 

platform/macos/godot_content_view.mm

@@ -323,7 +323,14 @@
 			NSString *file = [NSURL URLWithString:url].path;
 			files.push_back(String::utf8([file UTF8String]));
 		}
-		wd.drop_files_callback.call(files);
+		Variant v_files = files;
+		const Variant *v_args[1] = { &v_files };
+		Variant ret;
+		Callable::CallError ce;
+		wd.drop_files_callback.callp((const Variant **)&v_args, 1, ret, ce);
+		if (ce.error != Callable::CallError::CALL_OK) {
+			ERR_PRINT(vformat("Failed to execute drop files callback: %s.", Variant::get_callable_error_text(wd.drop_files_callback, v_args, 1, ce)));
+		}
 	}
 
 	return NO;

platform/macos/godot_status_item.mm

@@ -66,10 +66,13 @@
 	if (cb.is_valid()) {
 		Variant v_button = index;
 		Variant v_pos = ds->mouse_get_position();
-		Variant *v_args[2] = { &v_button, &v_pos };
+		const Variant *v_args[2] = { &v_button, &v_pos };
 		Variant ret;
 		Callable::CallError ce;
 		cb.callp((const Variant **)&v_args, 2, ret, ce);
+		if (ce.error != Callable::CallError::CALL_OK) {
+			ERR_PRINT(vformat("Failed to execute status indicator callback: %s.", Variant::get_callable_error_text(cb, v_args, 2, ce)));
+		}
 	}
 }
 

platform/web/display_server_web.cpp

@@ -112,7 +112,14 @@ void DisplayServerWeb::_drop_files_js_callback(const Vector<String> &p_files) {
 	if (!ds->drop_files_callback.is_valid()) {
 		return;
 	}
-	ds->drop_files_callback.call(p_files);
+	Variant v_files = p_files;
+	const Variant *v_args[1] = { &v_files };
+	Variant ret;
+	Callable::CallError ce;
+	ds->drop_files_callback.callp((const Variant **)&v_args, 1, ret, ce);
+	if (ce.error != Callable::CallError::CALL_OK) {
+		ERR_PRINT(vformat("Failed to execute drop files callback: %s.", Variant::get_callable_error_text(ds->drop_files_callback, v_args, 1, ce)));
+	}
 }
 
 // Web quit request callback.

platform/windows/display_server_windows.cpp

@@ -3842,7 +3842,12 @@ LRESULT DisplayServerWindows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 				}
 			}
 			if (system_theme_changed.is_valid()) {
-				system_theme_changed.call();
+				Variant ret;
+				Callable::CallError ce;
+				system_theme_changed.callp(nullptr, 0, ret, ce);
+				if (ce.error != Callable::CallError::CALL_OK) {
+					ERR_PRINT(vformat("Failed to execute system theme changed callback: %s.", Variant::get_callable_error_text(system_theme_changed, nullptr, 0, ce)));
+				}
 			}
 		} break;
 		case WM_THEMECHANGED: {
@@ -3897,10 +3902,13 @@ LRESULT DisplayServerWindows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 					} else if (indicators[iid].callback.is_valid()) {
 						Variant v_button = mb;
 						Variant v_pos = mouse_get_position();
-						Variant *v_args[2] = { &v_button, &v_pos };
+						const Variant *v_args[2] = { &v_button, &v_pos };
 						Variant ret;
 						Callable::CallError ce;
 						indicators[iid].callback.callp((const Variant **)&v_args, 2, ret, ce);
+						if (ce.error != Callable::CallError::CALL_OK) {
+							ERR_PRINT(vformat("Failed to execute status indicator callback: %s.", Variant::get_callable_error_text(indicators[iid].callback, v_args, 2, ce)));
+						}
 					}
 				}
 				return 0;
@@ -4868,7 +4876,14 @@ LRESULT DisplayServerWindows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 			}
 
 			if (files.size() && windows[window_id].drop_files_callback.is_valid()) {
-				windows[window_id].drop_files_callback.call(files);
+				Variant v_files = files;
+				const Variant *v_args[1] = { &v_files };
+				Variant ret;
+				Callable::CallError ce;
+				windows[window_id].drop_files_callback.callp((const Variant **)&v_args, 1, ret, ce);
+				if (ce.error != Callable::CallError::CALL_OK) {
+					ERR_PRINT(vformat("Failed to execute drop files callback: %s.", Variant::get_callable_error_text(windows[window_id].drop_files_callback, v_args, 1, ce)));
+				}
 			}
 		} break;
 		default: {