Navigator shows wrong context menu entries when the application is started with open file(s)

[meisenbarth-work]

Bug Description:

When an editor is already open (and thus restored) when Theia is started and you perform a right click in the file that belongs to that editor the context menu is almost empty, all entries that are file specific are missing. When you switch the editor or select a different file it works afterwards.

Steps to Reproduce:

1. Open a file (I used Blueprint to ensure it is not a issue in my application)
2. Click in the Navigator to give it focus
3. Reload the window
4. Open the context menu for the already preselected file in the navigator widget

Additional Information

• Operating System: Windows 10, Chrome
• Theia Version: 1.41.0 (Current Blueprint)

Debugging showed SelectionService.selection is not set.

[meisenbarth-work]

I did some more tests and the problem can be triggered more easily when Explorer: Auto Reveal is disabled.
The problem is, the URI passed to the event handler (UriAwareCommandHandler) is for the last active editor when the context menu for the currently selected node in the navigation widget is opened and not for the node. It looks like SelectionService.selection is not updated, since the node is already selected.

Why does the event handler use SelectionService.selection and not the uri from the node?

[meisenbarth-work]

As workaround I've now extended and rebound FileNavigatorWidget with:

protected override onAfterAttach(msg: Message): void {
    super.onAfterAttach(msg);
    this.addEventListener(this.node, 'focus', () => {
        if (this.props.globalSelection) {
            this.updateGlobalSelection();
        }
    }, true);
}

It looks like it works, but I am not sure that is the proper solution, maybe someone else could look into it?