"Selection -> Add next occurrence" shortcut not working when file opened from command line or URL scheme

[iliyang]

• VSCode Version: 1.33.1 (51b0b28)
• OS Version: macOS Mojave 10.14.4 (18E226)

Steps to Reproduce:

1. Open a file via open vscode://file/path/to/file or code -g /path/to/file
2. Navigate to a word using the keyboard and press Cmd+D shortcut

Does this issue occur when all extensions are disabled?: Yes

Additional notes:
The command works when activated via the menu "Selection -> Add next occurrence", but the shortcut Cmd+D doesn't work. I can re-enable the shortcut by changing the focus to another application and then back to VS Code, or by activating the search function (via Cmd+F) and deactivating it.

One may think this is not a big deal. However, when writing scientific papers with LaTeX (using the excellent LaTeX Workshop extension), activating VS Code via the URL scheme is a very common task. This is done when navigating to the LaTeX source by clicking on the generated PDF file in the Skim viewer.

[alexdima]

Duplicate of #71553