patch 9.0.0738: cannot suppress completion "scanning" messages
Problem: Cannot suppress completion "scanning" messages.
Solution: Add the "C" flag in 'shortmess'. (Bjorn Linse, closes #11354)
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index b3c4a40..ee6e5da 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -7079,6 +7079,8 @@
c don't give |ins-completion-menu| messages. For example,
"-- XXX completion (YYY)", "match 1 of 2", "The only match",
"Pattern not found", "Back at original", etc.
+ C don't give messages while scanning for ins-completion items,
+ for instance "scanning tags"
q use "recording" instead of "recording @a"
F don't give the file info when editing a file, like `:silent`
was used for the command; note that this also affects messages