patch 9.0.0916: getbufline() is inefficient for getting a single line
Problem: getbufline() is inefficient for getting a single line.
Solution: Add getbufoneline().
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 086081f..b6d98b9 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -935,6 +935,7 @@
Working with text in another buffer:
getbufline() get a list of lines from the specified buffer
+ getbufoneline() get a one line from the specified buffer
setbufline() replace a line in the specified buffer
appendbufline() append a list of lines in the specified buffer
deletebufline() delete lines from a specified buffer