[electron][menu] Selection menu is missing from the electron app

[kittaakos]

Description

I could not do Select All with Cmd+A on an input field; such as SCM, SIW. It turned out, the entire Selection menu is missing from the electron application. The registration seems to be correct in the monaco-menu module but is missing from ElectronMenuContribution#setMenu once the app has the 'ready' state.

I do not know if this is a monaco issue, or simply, we cannot play with the menu item indices on macOS, as we have the special Theia menu item at 0 position.

I am looking into this.

Reproduction Steps

OS and Theia version:

macOS, f255f5a

Diagnostics:

[kittaakos]

I do not know if this is a monaco issue

It is this: #446
The menu items are not visible, because the underlying command is not visible at app start up. And we do not support dynamic menu items.