Alt while a custom menu is open should return focus

[monk-time]

Issue Type: Bug

With "window.titleBarStyle": "custom", after opening any menu either by clicking on the menubar or with an Alt+* shortcut I can't close it and return focus to where it was before by tapping Alt once, only by hitting Esc twice (which is a bit awkward).

Pressing Alt to close the menu and return focus is an old Windows convention, and all other applications that I have running atm on my W7 machine follow it: Windows Explorer, Firefox, Adobe Reader, N++, foobar2000, qBittorrent, etc.

VSCode itself allows to move the focus to the menubar by pressing Alt and to return it back by pressing Alt once again. But as soon as a menu is expanded it takes the focus to itself and doesn't return it on Alt, so it's also inconsistent.

VS Code version: Code 1.26.0 (4e93618, 2018-08-13T16:29:31.933Z)
OS version: Windows_NT x64 6.1.7601

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4710HQ CPU @ 2.50GHz (8 x 2494)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Memory (System)	15.92GB (6.59GB free)
Process Argv	C:\Program Files_my\VS Code\Code.exe
Screen Reader	no
VM	0%

Extensions (9)

Extension	Author (truncated)	Version
overtype	ada	0.2.0
vscode-eslint	dba	1.4.12
gitlens	eam	8.5.4
hoogle-vscode	jca	0.0.4
language-haskell	jus	2.5.0
python	ms-	2018.7.1
block-travel	sas	0.0.2
selectline-statusbar	tom	0.0.2
haskero	Van	1.3.1

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Alt keyboard shortcuts focus menu (#54109)
• ALT+(key) doesn't open corresponding menu (#45312)
• Using ALT to focus menu bar breaks ALT multiple cursors/selection (#54065)
• Alt Tab invokes menu (#54047)
• Menu: should Alt move focus into the top level menu items? (#52936)