make float auto close configurable

[EdwarDu]

Some diag message may be long that close on CursorHold (updatetime) is not desirable.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mattn]

Thank you for the PR. The idea of making CursorHold float close behavior configurable is useful, but I think there is a bug in the current implementation.

The tap({_->s:hide_float()}) was removed from the main pipeline, which means the float is no longer hidden immediately on CursorMoved either. This causes the old diagnostic float to remain visible for up to g:lsp_diagnostics_float_delay ms (default 500ms) after the cursor moves, even though it's showing stale content at the wrong position.

The fix should only affect CursorHold behavior while keeping the immediate hide on CursorMoved. Something like:

let s:Dispose = lsp#callbag#pipe(
    \ lsp#callbag#merge(
    \   lsp#callbag#pipe(
    \       lsp#callbag#fromEvent(['CursorMoved']),
    \       lsp#callbag#tap({_->s:hide_float()}),
    \   ),
    \   lsp#callbag#pipe(
    \       lsp#callbag#fromEvent(['CursorHold']),
    \       lsp#callbag#filter({_->g:lsp_diagnostics_float_close_on_hold}),
    \       lsp#callbag#tap({_->s:hide_float()}),
    \   ),
    \   lsp#callbag#pipe(
    \       lsp#callbag#fromEvent(['InsertEnter']),
    \       lsp#callbag#filter({_->!g:lsp_diagnostics_float_insert_mode_enabled}),
    \       lsp#callbag#tap({_->s:hide_float()}),
    \   )
    \ ),
    \ lsp#callbag#filter({_->g:lsp_diagnostics_float_cursor}),
    \ lsp#callbag#debounceTime(g:lsp_diagnostics_float_delay),

This way CursorMoved still hides the float immediately (existing behavior), and only CursorHold close behavior becomes configurable.