diff --git a/experiments/outline-editor/editor.js b/experiments/outline-editor/editor.js
index c49823b..8fb312f 100755
--- a/experiments/outline-editor/editor.js
+++ b/experiments/outline-editor/editor.js
@@ -338,14 +338,17 @@ var templates = {
// nested button...
var nested_button
header = header
+ .trim()
.replace(/\[([^\]]*)\]/g,
function(_, text){
nested_button = true
- return `` })
+ return `` })
// whole text is a button...
if(!nested_button){
header =
- `