diff --git a/mergetools/vimdiff b/mergetools/vimdiff
index 8334871417..e27734b6e7 100644
--- a/mergetools/vimdiff
+++ b/mergetools/vimdiff
@@ -325,21 +325,17 @@ gen_cmd () {
 			CMD="$CMD | tabnew"
 		fi
 
+		# If this is a single window diff with all the buffers
+		if ! echo "$tab" | grep ",\|/" >/dev/null
+		then
+			CMD="$CMD | silent execute 'bufdo diffthis'"
+		fi
+
 		CMD=$(gen_cmd_aux "$tab" "$CMD")
 	done
 	IFS=$oldIFS
 
-
-	# Adjust the just obtained script depending on whether more than one
-	# windows are visible or not
-
-	if echo "$LAYOUT" | grep ",\|/" >/dev/null
-	then
-		CMD="$CMD | tabdo windo diffthis"
-	else
-		CMD="$CMD | silent bufdo diffthis"
-	fi
-
+	CMD="$CMD | tabdo windo diffthis"
 
 	# Add an extra "-c" option to move to the first tab (notice that we
 	# can't simply append the command to the previous "-c" string as
@@ -552,7 +548,7 @@ run_unit_tests () {
 	EXPECTED_CMD_01="-c \"set hidden diffopt-=hiddenoff | echo | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 2b | wincmd l | 3b | wincmd j | 4b | tabdo windo diffthis\" -c \"tabfirst\""
 	EXPECTED_CMD_02="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | 1b | wincmd l | 3b | tabdo windo diffthis\" -c \"tabfirst\""
 	EXPECTED_CMD_03="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 4b | wincmd l | 3b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_04="-c \"set hidden diffopt-=hiddenoff | echo | 4b | silent bufdo diffthis\" -c \"tabfirst\""
+	EXPECTED_CMD_04="-c \"set hidden diffopt-=hiddenoff | echo | silent execute 'bufdo diffthis' | 4b | tabdo windo diffthis\" -c \"tabfirst\""
 	EXPECTED_CMD_05="-c \"set hidden diffopt-=hiddenoff | echo | leftabove split | 1b | wincmd j | leftabove split | 4b | wincmd j | 3b | tabdo windo diffthis\" -c \"tabfirst\""
 	EXPECTED_CMD_06="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | leftabove split | 1b | wincmd j | 3b | wincmd l | 4b | tabdo windo diffthis\" -c \"tabfirst\""
 	EXPECTED_CMD_07="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | 4b | wincmd l | leftabove split | 1b | wincmd j | 3b | tabdo windo diffthis\" -c \"tabfirst\""