fix: diagnostic.refreshOnInsertMode

[clyfish]

1. diagnostic.refreshOnInsertMode should work when diagnostic.displayByAle == true
2. diagnostic.refreshOnInsertMode should work when diagnostics.length == 0

[chemzqm]

diagnostic.refreshAfterSave should work when diagnostic.displayByAle == true

No, you should use ale to configure it.

diagnostic.refreshAfterSave should work when diagnostics.length == 0

It's intended to clear diagnostics earlier.

[clyfish]

No, you should use ale to configure it.

I can't use ale to configure it.

My ale config:

let g:ale_lint_on_text_changed = 'never'
let g:ale_open_list = 1

[clyfish]

It's intended to clear diagnostics earlier.

If diagnostic.refreshOnInsertMode is true, the diagnostics should be cleared when leaving insert mode.

For example, I insert a character, and a diagnostic is cleared(diagnostics.length == 0), then I delete the character, the diagnostic won't restore(diagnostics.length == 1).

[chemzqm]

You're right.