patch 7.4.2244

Problem:    Adding pattern to ":oldfiles" is not a generic solution.
Solution:   Add the ":filter /pat/ cmd" command modifier.  Only works for some
            commands right now.

runtime/doc/various.txt

@@ -1,4 +1,4 @@
-*various.txt*   For Vim version 7.4.  Last change: 2016 Jul 29
+*various.txt*   For Vim version 7.4.  Last change: 2016 Aug 23
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -524,6 +524,25 @@ N  *+X11*		Unix only: can restore window title |X11|
 
 :redi[r] END		End redirecting messages.  {not in Vi}
 
+							*:filt* *:filter*
+:filt[er] {pat} {command}
+:filt[er] /{pat}/ {command}
+			Restrict the output of {command} to matches with {pat}.
+
+			{pat} is a Vim search pattern.  Instead of enclosing
+			it in / any non-ID character (see |'isident'|) can be
+			used, so long as it does not appear in {pat}.  Without
+			the enclosing character the pattern cannot include the
+			bar character.
+
+			The pattern is matched against the relevant part of
+			the output, not necessarily the whole line. Only some
+			commands support filtering, try it out to check if it
+			works.
+
+			Only normal messages are filtered, error messages are
+			not.
+
 						*:sil* *:silent* *:silent!*
 :sil[ent][!] {command}	Execute {command} silently.  Normal messages will not
 			be given or added to the message history.