Fix: Close alpha after SessionLoadPost.

[hoofcushion]

Problem:

• Alpha use a autocmd base on BufUnload to close alpha's instance.
• BufUnload will not be triggered by source a session file.
• Alpha will still try to redraw after buffer closed by loading a session, causing invalid buffer error since these autocmds were not cleared properly.

Solution:

• Add autocmd base on SessionLoadPost to close alpha after sourcing a session file.

[hoofcushion]

Issue probably about this (invalid buffer):

• Invalid buffer id-errors #266

[goolord]

I would prefer this, if you could sanity check that this does the same thing

[hoofcushion]

No, that's wrong, SessionLoadPost doesn't work with buffer attribute, because i tried.

[goolord]

ah, weird

[goolord]

ty for your contribution

[hoofcushion]

What does ty means? try?
I am Chinese.

I asked chat gpt and it says that means "thank you". I assume it's true.

[goolord]

yes, it means thank you

[jacoatvatfree]

I still get these errors from time to time when I use :Telescope oldfiles after just starting nvim with alpha as my dashboard. Seems that the events don't fire to tell alpha's autocmds to stop trying. I already configured alpha with

opts = {
    redraw_on_resize = false,
    noautocmd = true,
  }