Hot exit on switching folders

[Tyriar]

Parent issue: #101

Sublime has a feature that allows hot exit to always be allowed on a window provided it has a project associated with it. The initial concern still remains that backups may go missing if we just always enable this, the Sublime project system is nice because the act of creating a project (.sublime-project) is basically an opt in for project-level features.

Interested in people's ideas on this, here are a few:

• Enabling switching folders all the time?
• Enable if <project>/.vscode exists?
• Enable if a setting is toggled?
• Enable if a setting includes the workspace path? (has issues with multi-folder workspaces)

[Tyriar]

/cc @bpasero

[bpasero]

@Tyriar can you elaborate on the issue? you say I loose backups if I switch folders with dirty files opened?

[Tyriar]

In Sublime you can do this:

1. Open folder 1
2. Open folder 2
3. Create a .sublime-project for folder 2
4. Dirty folder 2 workspace (creates .sublime-workspace as a sibling to the .sublime-project)
5. Close folder 2 (it's allowed even though it's not the last window because it's a "project")

These backups are not restored if Sublime is then fully exited and relaunched.

We could fairly easily change VS Code to allow this by default, but the concern is that Untitled backups for example could go missing by users accidentally closing the non-last window and not getting it restored.

How #396 is solved could impact this as we may need to introduce a project concept.

[bpasero]

@Tyriar but is that 2 folders in the same window or in multiple windows? Do you imply that Sublime enables hot exit in this case even though the user did not enable it?

[Tyriar]

@bpasero folder 1 and folder 2 in the above example are in different windows. Hot exit is enabled by default, I'm assuming this is disabled as well when it's disabled.

[bpasero]

Ah so today for us when you close window 2 we ask for saving even though hot exit is enabled? That is the point I was missing.

[Tyriar]

Yeah that's right. I suggest this be deferred until after #396 is figured out.

[Tyriar]

Looked at Notepad++, it appears to have the same restrictions as Sublime Text where you can only close the last window. It also has a workspaces concept, however I did the following:

1. Opened a second window
2. Opened a folder as a workspace
3. Dirtied some files
4. Closed it, it exited without prompt

But then I couldn't figure out how to restore the old files and hot exit seems to not work at all any more.