Clean up WASM platform lookups

internal/driver/glfw/device_desktop.go

@@ -23,3 +23,7 @@ func (*glDevice) SystemScaleForWindow(w fyne.Window) float32 {
 
 	return scaleAuto
 }
+
+func isMacOSRuntime() bool {
+	return runtime.GOOS == "darwin"
+}

internal/driver/glfw/device_wasm.go

@@ -4,22 +4,27 @@ package glfw
 
 import (
 	"regexp"
+	"strings"
 	"syscall/js"
 
 	"fyne.io/fyne/v2"
 )
 
-var isMobile = regexp.MustCompile("Android|BlackBerry|iPhone|iPad|iPod|Opera Mini|IEMobile")
-
-var navigator = js.Global().Get("navigator")
-var userAgent = navigator.Get("userAgent").String()
-var mobileCheck = isMobile.MatchString(userAgent)
+var (
+	isMobile = regexp.MustCompile("Android|iPhone|iPad|iPod").
+			MatchString(js.Global().Get("navigator").Get("userAgent").String())
+	isMacOS = strings.Contains(js.Global().Get("window").Get("navigator").Get("platform").String(), "Mac")
+)
 
 func (*glDevice) IsMobile() bool {
-	return mobileCheck
+	return isMobile
 }
 
 func (*glDevice) SystemScaleForWindow(w fyne.Window) float32 {
 	// Get the scale information from the web browser directly
 	return float32(js.Global().Get("devicePixelRatio").Float())
 }
+
+func isMacOSRuntime() bool {
+	return isMacOS // Value depends on which OS the browser is running on.
+}