app: guarantee a ConfigEvent for every Window.Configure call

Not only is the client guaranteed a ConfigEvent, but app.Window
can assume that an unsupported decoration change will be corrected
(by a ConfigEvent with Decorated forced to the supported value).

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/os_android.go

@@ -1329,9 +1329,7 @@ func (w *window) Configure(options []Option) {
 		if cnf.Decorated != prev.Decorated {
 			w.config.Decorated = cnf.Decorated
 		}
-		if w.config != prev {
+		w.callbacks.Event(ConfigEvent{Config: w.config})
-			w.callbacks.Event(ConfigEvent{Config: w.config})
-		}
 	})
 }
 

app/os_ios.go

@@ -281,9 +281,7 @@ func (w *window) Configure([]Option) {
 	prev := w.config
 	// Decorations are never disabled.
 	w.config.Decorated = true
-	if w.config != prev {
+	w.w.Event(ConfigEvent{Config: w.config})
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
 }
 
 func (w *window) EditorStateChanged(old, new editorState) {}

app/os_js.go

@@ -533,9 +533,7 @@ func (w *window) Configure(options []Option) {
 	if cnf.Decorated != prev.Decorated {
 		w.config.Decorated = cnf.Decorated
 	}
-	if w.config != prev {
+	w.w.Event(ConfigEvent{Config: w.config})
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
 }
 
 func (w *window) Perform(system.Action) {}

app/os_macos.go

@@ -390,9 +390,7 @@ func (w *window) Configure(options []Option) {
 		C.setWindowStandardButtonHidden(w.window, C.NSWindowMiniaturizeButton, barTrans)
 		C.setWindowStandardButtonHidden(w.window, C.NSWindowZoomButton, barTrans)
 	}
-	if w.config != prev {
+	w.w.Event(ConfigEvent{Config: w.config})
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
 }
 
 func (w *window) setTitle(prev, cnf Config) {

app/os_wayland.go

@@ -1010,9 +1010,7 @@ func (w *window) Configure(options []Option) {
 			C.xdg_toplevel_set_max_size(w.topLvl, C.int32_t(scaled.X), C.int32_t(scaled.Y))
 		}
 	}
-	if w.config != prev || w.config.Decorated != cnf.Decorated {
+	w.w.Event(ConfigEvent{Config: w.config})
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
 }
 
 func (w *window) setTitle(prev, cnf Config) {

app/os_windows.go

@@ -188,7 +188,6 @@ func createNativeWindow() (*window, error) {
 // It reads the window style and size/position and updates w.config.
 // If anything has changed it emits a ConfigEvent to notify the application.
 func (w *window) update() {
-	var triggerEvent bool
 	r := windows.GetWindowRect(w.hwnd)
 	size := image.Point{
 		X: int(r.Right - r.Left - w.deltas.width),
@@ -210,17 +209,9 @@ func (w *window) update() {
 	} else {
 		mode = Windowed
 	}
-	if size != w.config.Size {
+	w.config.Size = size
-		w.config.Size = size
+	w.config.Mode = mode
-		triggerEvent = true
+	w.w.Event(ConfigEvent{Config: w.config})
-	}
-	if mode != w.config.Mode {
-		w.config.Mode = mode
-		triggerEvent = true
-	}
-	if triggerEvent {
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
 }
 
 func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr {

app/os_x11.go

@@ -234,9 +234,7 @@ func (w *x11Window) Configure(options []Option) {
 	if cnf.Decorated != prev.Decorated {
 		w.config.Decorated = cnf.Decorated
 	}
-	if w.config != prev {
+	w.w.Event(ConfigEvent{Config: w.config})
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
 }
 
 func (w *x11Window) setTitle(prev, cnf Config) {

app/window.go

@@ -861,16 +861,11 @@ func (w *Window) processEvent(d driver, e event.Event) bool {
 	case wakeupEvent:
 		select {
 		case opts := <-w.options:
-			// Send a decoration mode update, in case the driver does not
-			// support switching.
 			cnf := Config{Decorated: w.decorations.enabled}
 			for _, opt := range opts {
 				opt(w.metric, &cnf)
 			}
-			if w.decorations.enabled != cnf.Decorated {
+			w.decorations.enabled = cnf.Decorated
-				w.decorations.enabled = cnf.Decorated
-				w.out <- ConfigEvent{Config: w.effectiveConfig()}
-			}
 			d.Configure(opts)
 		default:
 		}