migrate-config: also make force_focus_wrapping a v4-only statement

i3-migrate-config-to-v4.pl

@@ -60,7 +60,9 @@ sub need_to_convert {
 
     for my $line (@lines) {
         # only v4 configfiles can use bindcode or workspace_layout
-        return 0 if $line =~ /^bindcode/ || $line =~ /^workspace_layout/;
+        return 0 if $line =~ /^bindcode/ ||
+                    $line =~ /^workspace_layout/ ||
+                    $line =~ /^force_focus_wrapping/;
 
         # have a look at bindings
         next unless $line =~ /^bind/;

src/cfgparse.y

@@ -65,6 +65,7 @@ static int detect_version(char *buf) {
 
         /* check for some v4-only statements */
         if (strncasecmp(line, "bindcode", strlen("bindcode")) == 0 ||
+            strncasecmp(line, "force_focus_wrapping", strlen("force_focus_wrapping")) == 0 ||
             strncasecmp(line, "# i3 config file (v4)", strlen("# i3 config file (v4)")) == 0 ||
             strncasecmp(line, "workspace_layout", strlen("workspace_layout")) == 0) {
             printf("deciding for version 4 due to this line: %.*s\n", (int)(walk-line), line);