Action argument in enclosed form should allow new lines

Close #3138

CHANGELOG.md

@@ -1,6 +1,10 @@
 CHANGELOG
 =========
 
+0.36.1
+------
+- Bug fixes and improvements
+
 0.36.0
 ------
 - Added `--listen=HTTP_PORT` option to start HTTP server. It allows external

src/options.go

@@ -954,7 +954,7 @@ Loop:
 		ce = regexp.QuoteMeta(ce)
 
 		// @$ or @+
-		loc = regexp.MustCompile(fmt.Sprintf(`^%s.*?(%s[+,]|%s$)`, cs, ce, ce)).FindStringIndex(action)
+		loc = regexp.MustCompile(fmt.Sprintf(`(?s)^%s.*?(%s[+,]|%s$)`, cs, ce, ce)).FindStringIndex(action)
 		if loc == nil {
 			masked += action
 			break

src/options_test.go

@@ -268,7 +268,7 @@ func TestBind(t *testing.T) {
 	}
 	parseKeymap(keymap,
 		"ctrl-a:kill-line,ctrl-b:toggle-sort+up+down,c:page-up,alt-z:page-down,"+
-			"f1:execute(ls {+})+abort+execute(echo {+})+select-all,f2:execute/echo {}, {}, {}/,f3:execute[echo '({})'],f4:execute;less {};,"+
+			"f1:execute(ls {+})+abort+execute(echo \n{+})+select-all,f2:execute/echo {}, {}, {}/,f3:execute[echo '({})'],f4:execute;less {};,"+
 			"alt-a:execute-Multi@echo (,),[,],/,:,;,%,{}@,alt-b:execute;echo (,),[,],/,:,@,%,{};,"+
 			"x:Execute(foo+bar),X:execute/bar+baz/"+
 			",f1:+first,f1:+top"+