patch 8.1.1888: more functions can be used as methods
Problem: More functions can be used as methods.
Solution: Make various functions usable as a method.
diff --git a/src/testdir/test_balloon_gui.vim b/src/testdir/test_balloon_gui.vim
index 5b486c0..70a88f3 100644
--- a/src/testdir/test_balloon_gui.vim
+++ b/src/testdir/test_balloon_gui.vim
@@ -12,7 +12,7 @@
call balloon_show('')
let msg = 'that that'
- call balloon_show(msg)
+ eval msg->balloon_show()
call assert_equal(msg, balloon_gettext())
sleep 10m
call balloon_show('')