Multiple fixes. Thanks @kron!

docs/src/content/docs/changelog.mdx

@@ -121,6 +121,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed Webview2 detection path in HKCU by [@leaanthony](https://github.com/leaanthony).
 - Fixed input issue with macOS by [@leaanthony](https://github.com/leaanthony).
 - Fixed Windows icon generation task file name by [@yulesxoxo](https://github.com/yulesxoxo) in [#4219](https://github.com/wailsapp/wails/pull/4219).
+- Fixed transparency issue for frameless windows by [@leaanthony](https://github.com/leaanthony) based on work by @kron.
+- Fixed focus calls when window is disabled or minimised by [@leaanthony](https://github.com/leaanthony) based on work by @kron.
+- Fixed system trays not showing after taskbar restarts by [@leaanthony](https://github.com/leaanthony) based on work by @kron.
 
 ### Changed
 

v3/pkg/application/application_windows.go

@@ -8,7 +8,9 @@ import (
 	"path/filepath"
 	"slices"
 	"sync"
+	"sync/atomic"
 	"syscall"
+	"time"
 	"unsafe"
 
 	"github.com/wailsapp/go-webview2/webviewloader"
@@ -18,6 +20,10 @@ import (
 	"github.com/wailsapp/wails/v3/pkg/w32"
 )
 
+var (
+	wmTaskbarCreated = w32.RegisterWindowMessage(w32.MustStringToUTF16Ptr("TaskbarCreated"))
+)
+
 type windowsApp struct {
 	parent *App
 
@@ -40,6 +46,9 @@ type windowsApp struct {
 	// system theme
 	isCurrentlyDarkMode bool
 	currentWindowID     uint
+
+	// Restart taskbar flag
+	restartingTaskbar atomic.Bool
 }
 
 func (m *windowsApp) isDarkMode() bool {
@@ -221,6 +230,17 @@ func (m *windowsApp) wndProc(hwnd w32.HWND, msg uint32, wParam, lParam uintptr)
 	}
 
 	switch msg {
+	case wmTaskbarCreated:
+		if m.restartingTaskbar.Load() {
+			break
+		}
+		m.restartingTaskbar.Store(true)
+		m.reshowSystrays()
+		go func() {
+			// 1 second debounce
+			time.Sleep(1000)
+			m.restartingTaskbar.Store(false)
+		}()
 	case w32.WM_SETTINGCHANGE:
 		settingChanged := w32.UTF16PtrToString((*uint16)(unsafe.Pointer(lParam)))
 		if settingChanged == "ImmersiveColorSet" {
@@ -297,6 +317,14 @@ func (m *windowsApp) unregisterWindow(w *windowsWebviewWindow) {
 	}
 }
 
+func (m *windowsApp) reshowSystrays() {
+	m.systrayMapLock.Lock()
+	defer m.systrayMapLock.Unlock()
+	for _, systray := range m.systrayMap {
+		systray.reshow()
+	}
+}
+
 func setupDPIAwareness() error {
 	// https://learn.microsoft.com/en-us/windows/win32/hidpi/setting-the-default-dpi-awareness-for-a-process
 	// https://learn.microsoft.com/en-us/windows/win32/hidpi/high-dpi-desktop-application-development-on-windows

v3/pkg/application/systemtray_windows.go

@@ -431,3 +431,19 @@ func (s *windowsSystemTray) Show() {
 func (s *windowsSystemTray) Hide() {
 	// No-op
 }
+
+func (s *windowsSystemTray) reshow() {
+	// Add icons back to systray
+	nid := w32.NOTIFYICONDATA{
+		HWnd:             s.hwnd,
+		UID:              uint32(s.parent.id),
+		UFlags:           w32.NIF_ICON | w32.NIF_MESSAGE,
+		HIcon:            s.currentIcon,
+		UCallbackMessage: WM_USER_SYSTRAY,
+	}
+	nid.CbSize = uint32(unsafe.Sizeof(nid))
+	// Show the icon
+	if !w32.ShellNotifyIcon(w32.NIM_ADD, &nid) {
+		panic(syscall.GetLastError())
+	}
+}

v3/pkg/application/webview_window_windows.go

@@ -273,9 +273,12 @@ func (w *windowsWebviewWindow) run() {
 
 	exStyle := w32.WS_EX_CONTROLPARENT
 	if options.BackgroundType != BackgroundTypeSolid {
-		exStyle |= w32.WS_EX_NOREDIRECTIONBITMAP
-		if w.parent.options.IgnoreMouseEvents {
+		if (options.Frameless && options.BackgroundType == BackgroundTypeTransparent) || w.parent.options.IgnoreMouseEvents {
+			// Always if transparent and frameless
 			exStyle |= w32.WS_EX_TRANSPARENT | w32.WS_EX_LAYERED
+		} else {
+			// Only WS_EX_NOREDIRECTIONBITMAP if not (and not solid)
+			exStyle |= w32.WS_EX_NOREDIRECTIONBITMAP
 		}
 	}
 	if options.AlwaysOnTop {
@@ -788,6 +791,14 @@ func (w *windowsWebviewWindow) setFullscreenButtonEnabled(_ bool) {
 
 func (w *windowsWebviewWindow) focus() {
 	w32.SetForegroundWindow(w.hwnd)
+
+	if w.isDisabled() {
+		return
+	}
+	if w.isMinimised() {
+		w.unminimise()
+	}
+
 	w.focusingChromium = true
 	w.chromium.Focus()
 	w.focusingChromium = false
@@ -1041,6 +1052,11 @@ func (w *windowsWebviewWindow) disableIcon() {
 	)
 }
 
+func (w *windowsWebviewWindow) isDisabled() bool {
+	style := uint32(w32.GetWindowLong(w.hwnd, w32.GWL_STYLE))
+	return style&w32.WS_DISABLED != 0
+}
+
 func (w *windowsWebviewWindow) updateTheme(isDarkMode bool) {
 
 	if w32.IsCurrentlyHighContrastMode() {

v3/pkg/w32/user32.go

@@ -178,6 +178,8 @@ var (
 
 	procRedrawWindow = moduser32.NewProc("RedrawWindow")
 
+	procRegisterWindowMessageW = moduser32.NewProc("RegisterWindowMessageW")
+
 	mainThread HANDLE
 )
 
@@ -299,9 +301,7 @@ func PostThreadMessage(threadID HANDLE, msg int, wp, lp uintptr) {
 }
 
 func RegisterWindowMessage(name *uint16) uint32 {
-	ret, _, _ := procRegisterWindowMessageA.Call(
-		uintptr(unsafe.Pointer(name)))
-
+	ret, _, _ := procRegisterWindowMessageW.Call(uintptr(unsafe.Pointer(name)))
 	return uint32(ret)
 }