Diagnostic float: Record position before debounce time

It seems that we should be recording the current buffer, cursor position
and change tick before we wait to see if the float should be shown or
not.  Otherwise, if any of the above change during the
`g:lsp_diagnostics_float_delay` our recording would be incorrect.

Author: ilya-bobyr

autoload/lsp/internal/diagnostics/float.vim

@@ -26,9 +26,17 @@ function! lsp#internal#diagnostics#float#_enable() abort
         \ ),
         \ lsp#callbag#filter({_->g:lsp_diagnostics_float_cursor}),
         \ lsp#callbag#tap({_->s:hide_float()}),
+        \ lsp#callbag#map({_->{
+        \   'bufnr': bufnr('%'),
+        \   'curpos': getcurpos()[0:2],
+        \   'changedtick': b:changedtick
+        \ }}),
         \ lsp#callbag#debounceTime(g:lsp_diagnostics_float_delay),
-        \ lsp#callbag#map({_->{'bufnr': bufnr('%'), 'curpos': getcurpos()[0:2], 'changedtick': b:changedtick }}),
-        \ lsp#callbag#distinctUntilChanged({a,b -> a['bufnr'] == b['bufnr'] && a['curpos'] == b['curpos'] && a['changedtick'] == b['changedtick']}),
+        \ lsp#callbag#distinctUntilChanged({a,b ->
+        \      a['bufnr'] == b['bufnr']
+        \   && a['curpos'] == b['curpos']
+        \   && a['changedtick'] == b['changedtick']
+        \ }),
         \ lsp#callbag#filter({_->mode() is# 'n'}),
         \ lsp#callbag#filter({_->getbufvar(bufnr('%'), '&buftype') !=# 'terminal' }),
         \ lsp#callbag#map({_->lsp#internal#diagnostics#under_cursor#get_diagnostic()}),