patch 8.1.0169: calling message_filtered() a bit too often

Problem:    Calling message_filtered() a bit too often.
Solution:   Only call message_filtered() when filtering is already false.

runtime/doc/quickfix.txt

@@ -298,6 +298,10 @@ processing a quickfix or location list command, it will be aborted.
 			from the last error backwards, -1 being the last error.
 			The 'switchbuf' settings are respected when jumping
 			to a buffer.
+			The |:filter| command can be used to display only the
+			quickfix entries matching a supplied pattern. The
+			pattern is matched against the filename, module name,
+			pattern and text of the entry.
 
 :cl[ist] +{count}	List the current and next {count} valid errors.  This
 			is similar to ":clist from from+count", where "from"
@@ -1287,7 +1291,7 @@ to the file.
 Changing directory
 
 The following uppercase conversion characters specify the type of special
-format strings.  At most one of them may be given as a prefix at the begin
+format strings.  At most one of them may be given as a prefix at the beginning
 of a single comma-separated format pattern.
 Some compilers produce messages that consist of directory names that have to
 be prepended to each file name read by %f (example: GNU make).  The following

src/quickfix.c

@@ -3139,18 +3139,21 @@ qf_list(exarg_T *eap)
 		    sprintf((char *)IObuff, "%2d", i);
 		else
 		    vim_snprintf((char *)IObuff, IOSIZE, "%2d %s",
-								i, (char *)fname);
+							     i, (char *)fname);
 	    }
 
 	    // Support for filtering entries using :filter /pat/ clist
-	    filter_entry = 1;
+	    // Match against the module name, file name, search pattern and
+	    // text of the entry.
+	    filter_entry = TRUE;
 	    if (qfp->qf_module != NULL && *qfp->qf_module != NUL)
 		filter_entry &= message_filtered(qfp->qf_module);
-	    if (fname != NULL)
+	    if (filter_entry && fname != NULL)
 		filter_entry &= message_filtered(fname);
-	    if (qfp->qf_pattern != NULL)
+	    if (filter_entry && qfp->qf_pattern != NULL)
 		filter_entry &= message_filtered(qfp->qf_pattern);
-	    filter_entry &= message_filtered(qfp->qf_text);
+	    if (filter_entry)
+		filter_entry &= message_filtered(qfp->qf_text);
 	    if (filter_entry)
 		goto next_entry;
 

src/version.c

@@ -789,6 +789,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    169,
 /**/
     168,
 /**/