From de0875074eae17161775cb4ea7dab16f6c115c3d Mon Sep 17 00:00:00 2001
From: Andreas Louv <andreas@louv.dk>
Date: Mon, 22 May 2023 22:57:03 +0200
Subject: [PATCH] Respect when "&completeopt" doesn't contain "preview"

---
 autoload/lsp/completion.vim | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/autoload/lsp/completion.vim b/autoload/lsp/completion.vim
index 444ec08..a8ef1a9 100644
--- a/autoload/lsp/completion.vim
+++ b/autoload/lsp/completion.vim
@@ -404,15 +404,16 @@ def ShowCompletionDocumentation(cItem: any)
     id->popup_show()
   else
     # &omnifunc with &completeopt =~ 'preview'
-    execute $':silent! pedit Completion'
-    :wincmd P
-    :setlocal buftype=nofile
-    :setlocal bufhidden=delete
-    bufnr()->deletebufline(1, '$')
-    infoText->append(0)
-    [1, 1]->cursor()
-    exe $'setlocal ft={infoKind}'
-    :wincmd p
+    try
+      :wincmd P
+      :setlocal modifiable
+      bufnr()->deletebufline(1, '$')
+      infoText->append(0)
+      [1, 1]->cursor()
+      exe $'setlocal ft={infoKind}'
+      :wincmd p
+    catch /E441/ # No preview window
+    endtry
   endif
 enddef
 
-- 
2.48.1