ImGui keyboard navigation is basically broken.

[bryanedds]

Enabling keyboard nav in ImGui causes the following issues -

1. You need to temporarily disable navigation while alt is down in order to stop alt-tab (and other alt-combos) from being interpreted as menu alt.
2. Keyboard nav on hierarchy can't be made to also change selected entity to my knowledge, meaning we have two active cursors, causing confusion.
3. Alt+Up on hierarchy also ends up creating a menu alt, even with nav disabled.

Maybe a future version of ImGui will improve keyboard nav, but until then, the alternative might be to try to implement manually where it's needed (hierarchy and property grid).

Related reports -

ocornut/imgui#3560

[bryanedds]

Most of the issues are relating to alt not playing well with imgui kb nav. Perhaps the best approach would be to simply not forward an alt key inputs to imgui and if gaia needs to check for alt state, do so with the engine's KeyboardState API. It's a bit hacky, but maybe it'll be a path forward.

EDIT: not sure if this will work since many non-US languages use alt for non-US characters.