Bugfix: Better support for showing window

v2/internal/frontend/desktop/windows/frontend.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"github.com/wailsapp/wails/v2/internal/frontend/desktop/windows/win32"
 	"io"
 	"log"
 	"net/http"
@@ -589,30 +590,54 @@ func (f *Frontend) navigationCompleted(sender *edge.ICoreWebView2, args *edge.IC
 	switch f.frontendOptions.WindowStartState {
 	case options.Maximised:
 		if !f.frontendOptions.DisableResize {
-			f.mainWindow.Maximise()
+			win32.ShowWindowMaximised(f.mainWindow.Handle())
 		} else {
-			f.mainWindow.Show()
+			win32.ShowWindow(f.mainWindow.Handle())
 		}
-		f.ShowWindow()
-
 	case options.Minimised:
-		f.mainWindow.Minimise()
+		win32.ShowWindowMinimised(f.mainWindow.Handle())
 	case options.Fullscreen:
 		f.mainWindow.Fullscreen()
-		f.ShowWindow()
+		win32.ShowWindow(f.mainWindow.Handle())
 	default:
 		if f.frontendOptions.Fullscreen {
 			f.mainWindow.Fullscreen()
 		}
-		f.ShowWindow()
+		win32.ShowWindow(f.mainWindow.Handle())
 	}
 
+	f.mainWindow.hasBeenShown = true
+
 }
 
 func (f *Frontend) ShowWindow() {
 	f.mainWindow.Invoke(func() {
-		if f.mainWindow.IsMinimised() {
-			f.mainWindow.Restore()
+		if !f.mainWindow.hasBeenShown {
+			f.mainWindow.hasBeenShown = true
+			switch f.frontendOptions.WindowStartState {
+			case options.Maximised:
+				if !f.frontendOptions.DisableResize {
+					win32.ShowWindowMaximised(f.mainWindow.Handle())
+				} else {
+					win32.ShowWindow(f.mainWindow.Handle())
+				}
+			case options.Minimised:
+				win32.RestoreWindow(f.mainWindow.Handle())
+			case options.Fullscreen:
+				f.mainWindow.Fullscreen()
+				win32.ShowWindow(f.mainWindow.Handle())
+			default:
+				if f.frontendOptions.Fullscreen {
+					f.mainWindow.Fullscreen()
+				}
+				win32.ShowWindow(f.mainWindow.Handle())
+			}
+		} else {
+			if win32.IsWindowMinimised(f.mainWindow.Handle()) {
+				win32.RestoreWindow(f.mainWindow.Handle())
+			} else {
+				win32.ShowWindow(f.mainWindow.Handle())
+			}
 		}
 		w32.SetForegroundWindow(f.mainWindow.Handle())
 		w32.SetFocus(f.mainWindow.Handle())

v2/internal/frontend/desktop/windows/win32/consts.go

@@ -15,6 +15,7 @@ var (
 	moduser32                = syscall.NewLazyDLL("user32.dll")
 	procSystemParametersInfo = moduser32.NewProc("SystemParametersInfoW")
 	procGetWindowLong        = moduser32.NewProc("GetWindowLongW")
+	procShowWindow           = moduser32.NewProc("ShowWindow")
 )
 var (
 	moddwmapi                        = syscall.NewLazyDLL("dwmapi.dll")

v2/internal/frontend/desktop/windows/win32/window.go

@@ -16,6 +16,23 @@ const (
 	GWL_STYLE = -16
 )
 
+const (
+	SW_HIDE            = 0
+	SW_NORMAL          = 1
+	SW_SHOWNORMAL      = 1
+	SW_SHOWMINIMIZED   = 2
+	SW_MAXIMIZE        = 3
+	SW_SHOWMAXIMIZED   = 3
+	SW_SHOWNOACTIVATE  = 4
+	SW_SHOW            = 5
+	SW_MINIMIZE        = 6
+	SW_SHOWMINNOACTIVE = 7
+	SW_SHOWNA          = 8
+	SW_RESTORE         = 9
+	SW_SHOWDEFAULT     = 10
+	SW_FORCEMINIMIZE   = 11
+)
+
 // http://msdn.microsoft.com/en-us/library/windows/desktop/bb773244.aspx
 type MARGINS struct {
 	CxLeftWidth, CxRightWidth, CyTopHeight, CyBottomHeight int32
@@ -42,6 +59,21 @@ func IsWindowMinimised(hwnd uintptr) bool {
 	return style&WS_MINIMIZE != 0
 }
 
+func RestoreWindow(hwnd uintptr) {
+	showWindow(hwnd, SW_RESTORE)
+}
+
+func ShowWindow(hwnd uintptr) {
+	showWindow(hwnd, SW_SHOW)
+}
+
+func ShowWindowMaximised(hwnd uintptr) {
+	showWindow(hwnd, SW_MAXIMIZE)
+}
+func ShowWindowMinimised(hwnd uintptr) {
+	showWindow(hwnd, SW_MINIMIZE)
+}
+
 func dwmExtendFrameIntoClientArea(hwnd uintptr, margins *MARGINS) error {
 	ret, _, _ := procDwmExtendFrameIntoClientArea.Call(
 		hwnd,
@@ -61,3 +93,11 @@ func getWindowLong(hwnd uintptr, index int) int32 {
 
 	return int32(ret)
 }
+
+func showWindow(hwnd uintptr, cmdshow int) bool {
+	ret, _, _ := procShowWindow.Call(
+		hwnd,
+		uintptr(cmdshow))
+
+	return ret != 0
+}

v2/internal/frontend/desktop/windows/window.go

@@ -22,6 +22,7 @@ type Window struct {
 	versionInfo                              *operatingsystem.WindowsVersionInfo
 	isDarkMode                               bool
 	isActive                                 bool
+	hasBeenShown                             bool
 }
 
 func NewWindow(parent winc.Controller, appoptions *options.App, versionInfo *operatingsystem.WindowsVersionInfo) *Window {