Keyboard shortcuts that use alt + some dead key don't work

[pubfnbar]

Issue Type: Bug

I use an Apple Magic keyboard with the standard US keyboard layout, which has dead keys on Alt+e, Alt+i, Alt+n, Alt+u, and Alt+`. Dead keys produce a certain accent character and then combine that accent with the character you type next (if it's possible to combine those two). I've always mapped arrow keys to Alt+j, Alt+k, Alt+l, and Alt+i in Sublime Text so that i can move the cursor without moving my right hand. But with VS Code, mapping Alt+i to the up-arrow (or rather the cursorUp command) doesn't work (nor does mapping from any other dead key). Pressing Alt+i just produces the ˆ accent character no matter what it is mapped to in VS Code.

VS Code version: Code 1.47.3 (91899dc, 2020-07-23T13:08:29.692Z)
OS version: Darwin x64 19.6.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-4570R CPU @ 2.70GHz (4 x 2700)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	8.00GB (0.08GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (3)

Extension	Author (truncated)	Version
Bookmarks	ale	11.3.1
toml	be5	0.5.1
rust-analyzer	mat	0.2.273

[alexdima]

Duplicate of #41024 . We have done all we can and reported the bug upstream to Chromium.