app: [android] remove redundant ConfigEvent in onStop and onSurfaceDestroyed

Config.Focused represents window interaction focus, which should only
change when the window gains or loses user interaction capability.

The focus state is already correctly handled in:
- onResume → focused = true  (window gains interaction focus)
- onPause  → focused = false (window loses interaction focus)

Therefore, sending additional ConfigEvent in onStop and onSurfaceDestroyed
is redundant because:
- onStop is always preceded by onPause
- onSurfaceDestroyed is a low-level surface event unrelated to focus

This cleanup aligns the Android implementation with the correct semantic
that Config.Focused = window interaction focus, not view focus or
surface state.

Signed-off-by: CoyAce <akeycoy@gmail.com>

app/os_android.go

@@ -121,7 +121,6 @@ import "C"
 import (
 	"errors"
 	"fmt"
-	"gioui.org/io/transfer"
 	"image"
 	"image/color"
 	"io"
@@ -137,6 +136,8 @@ import (
 	"unicode/utf16"
 	"unsafe"
 
+	"gioui.org/io/transfer"
+
 	"gioui.org/internal/f32color"
 	"gioui.org/op"
 
@@ -162,7 +163,6 @@ type window struct {
 	insets    pixelInsets
 
 	visible   bool
-	focused   bool
 	started   bool
 	animating bool
 
@@ -527,7 +527,6 @@ func Java_org_gioui_GioView_onStopView(env *C.JNIEnv, class C.jclass, handle C.j
 	w := cgo.Handle(handle).Value().(*window)
 	w.started = false
 	w.visible = false
-	w.sendConfigEvent()
 }
 
 //export Java_org_gioui_GioView_onStartView
@@ -544,7 +543,6 @@ func Java_org_gioui_GioView_onSurfaceDestroyed(env *C.JNIEnv, class C.jclass, ha
 	w := cgo.Handle(handle).Value().(*window)
 	w.win = nil
 	w.visible = false
-	w.sendConfigEvent()
 }
 
 //export Java_org_gioui_GioView_onSurfaceChanged
@@ -590,8 +588,8 @@ func Java_org_gioui_GioView_onBack(env *C.JNIEnv, class C.jclass, view C.jlong)
 //export Java_org_gioui_GioView_onFocusChange
 func Java_org_gioui_GioView_onFocusChange(env *C.JNIEnv, class C.jclass, view C.jlong, focus C.jboolean) {
 	w := cgo.Handle(view).Value().(*window)
-	w.focused = focus == C.JNI_TRUE
-	w.sendConfigEvent()
+	w.config.Focused = focus == C.JNI_TRUE
+	w.processEvent(ConfigEvent{Config: w.config})
 }
 
 //export Java_org_gioui_GioView_onWindowInsets
@@ -817,15 +815,9 @@ func (w *window) setVisible(env *C.JNIEnv) {
 		return
 	}
 	w.visible = true
-	w.sendConfigEvent()
 	w.draw(env, true)
 }
 
-func (w *window) sendConfigEvent() {
-	w.config.Focused = w.visible && w.focused
-	w.processEvent(ConfigEvent{Config: w.config})
-}
-
 func (w *window) setVisual(visID int) error {
 	if C.ANativeWindow_setBuffersGeometry(w.win, 0, 0, C.int32_t(visID)) != 0 {
 		return errors.New("ANativeWindow_setBuffersGeometry failed")
@@ -868,7 +860,7 @@ func (w *window) draw(env *C.JNIEnv, sync bool) {
 	size := image.Pt(int(C.ANativeWindow_getWidth(w.win)), int(C.ANativeWindow_getHeight(w.win)))
 	if size != w.config.Size {
 		w.config.Size = size
-		w.sendConfigEvent()
+		w.processEvent(ConfigEvent{Config: w.config})
 	}
 	if size.X == 0 || size.Y == 0 {
 		return
@@ -1404,7 +1396,7 @@ func (w *window) setConfig(env *C.JNIEnv, cnf Config) {
 	if cnf.Decorated != prev.Decorated {
 		w.config.Decorated = cnf.Decorated
 	}
-	w.sendConfigEvent()
+	w.processEvent(ConfigEvent{Config: w.config})
 }
 
 func (w *window) Perform(system.Action) {}