Replace wrong XK_menu mapped values to correct CodeProps

* it's alternativelly code for menu (not GUI)

Author: misak113

go.mod

@@ -13,3 +13,5 @@ require (
 	golang.org/x/tools v0.0.0-20200207183749-b753a1ba74fa
 	golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898
 )
+
+replace golang.org/x/mobile => github.com/misak113/mobile v0.0.0-20210103170524-21e5a0da1870

go.sum

@@ -4,6 +4,8 @@ github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802 h1:1BDTz0u9nC3//pOC
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4 h1:WtGNWLvXpe6ZudgnXrq0barxBImvnnJoMEhXAzcbM0I=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/misak113/mobile v0.0.0-20210103170524-21e5a0da1870 h1:aY61pPEbj2YiIDdjBvnvbkTxxGuBps3CS7Qirb1AODg=
+github.com/misak113/mobile v0.0.0-20210103170524-21e5a0da1870/go.mod h1:skQtrUTUwhdJvXM/2KKJzY8pDgNr9I/FOMqDVRPBUS4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=

shiny/driver/internal/x11key/x11key.go

@@ -204,7 +204,7 @@ var nonUnicodeKeycodes = map[rune]key.Code{
 	xkPageDown:   key.CodePageDown,
 	xkEnd:        key.CodeEnd,
 	xkInsert:     key.CodeInsert,
-	xkMenu:       key.CodeRightGUI, // TODO: CodeRightGUI or CodeMenu??
+	xkMenu:       key.CodeProps,
 	xkHelp:       key.CodeHelp,
 	xkNumLock:    key.CodeKeypadNumLock,
 	xkMultiKey:   key.CodeCompose,