fix #4276: honor b:ale_enabled for hover at cursor

[hiberabyss]

No description provided.

[hiberabyss]

Could anyone have a look of this?

[hsanson]

Lint tests are failing. Recommend enabling the ale custom linter for vim files so ALE let's you know about the issues:

let g:ale_linters = {
  \   'vim': ['ale_custom_linting_rules']
\}

[hiberabyss]

Lint tests are failing. Recommend enabling the ale custom linter for vim files so ALE let's you know about the issues:

let g:ale_linters = {
  \   'vim': ['ale_custom_linting_rules']
\}

Update indention to avoid test failure.

[hsanson]

Looks good, thanks.