commit 50e5376926dc2ec4a26a7a16f8f0f3213c4afdf0
author Bram Moolenaar <Bram@vim.org> Thu Oct 27 14:49:15 2016 +0200
committer Bram Moolenaar <Bram@vim.org> Thu Oct 27 14:49:15 2016 +0200
tree fe1420b53a534de8895d791e044ca9df8d5769b2
parent 46fceaaa8d1447a9588736d86eb4908214187b08

patch 8.0.0047
Problem:    Crash when using the preview window from an unnamed buffer.
            (lifepillar)
Solution:   Do not clear the wrong buffer. (closes #1200)

src/popupmnu.c

diff --git a/src/popupmnu.c b/src/popupmnu.c
index d9d1fee..b479b00 100644
--- a/src/popupmnu.c
+++ b/src/popupmnu.c
@@ -582,7 +582,9 @@
 
 	    if (curwin->w_p_pvw)
 	    {
-		if (curbuf->b_fname == NULL
+		if (!resized
+			&& curbuf->b_nwindows == 1
+			&& curbuf->b_fname == NULL
 			&& curbuf->b_p_bt[0] == 'n' && curbuf->b_p_bt[2] == 'f'
 			&& curbuf->b_p_bh[0] == 'w')
 		{