Fix lsp_show_scope_name command not working if view was dragged to a new window

[jwortmann]

It is the same bug and fix as #1852.

I think the actual underlying bug is in the ST API, because

LSP/boot.py

Line 202 in f1e96dc

def on_post_move_async(self, view: sublime.View) -> None:

is only called when a view is dragged between two existing windows (or inside a single window), but not when it is dragged to a new window. I've tested and verified this with a few print statements.

With this API bug, the WindowRegistry doesn't get to know the new window ID, and therefore

LSP/plugin/core/registry.py

Line 76 in f1e96dc

return windows.listener_for_view(self.view)

doesn't work, which is called by LspTextCommand.is_enabled(), which then will return False.