From d10ea1fe0dd721cfc7895bca20ca888491768323 Mon Sep 17 00:00:00 2001
From: nightwing <amirjanyan@gmail.com>
Date: Tue, 13 Dec 2011 01:23:13 +0400
Subject: [PATCH] show some feedback to user action, when fold can't be added

---
 lib/ace/css/editor.css          | 8 +++++++-
 lib/ace/edit_session/folding.js | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/ace/css/editor.css b/lib/ace/css/editor.css
index 32449578..35c524db 100644
--- a/lib/ace/css/editor.css
+++ b/lib/ace/css/editor.css
@@ -224,6 +224,8 @@
     background-image: url("data:image/png,%89PNG%0D%0A%1A%0A%00%00%00%0DIHDR%00%00%00%05%00%00%00%05%08%06%00%00%00%8Do%26%E5%00%00%004IDATx%DAe%8A%B1%0D%000%0C%C2%F2%2CK%96%BC%D0%8F9%81%88H%E9%D0%0E%96%C0%10%92%3E%02%80%5E%82%E4%A9*-%EEsw%C8%CC%11%EE%96w%D8%DC%E9*Eh%0C%151(%00%00%00%00IEND%AEB%60%82");
     background-repeat: no-repeat;
     background-position: center 5px;
+
+    border-radius: 3px;
 }
 
 .ace_fold-widget.end {
@@ -237,7 +239,6 @@
 .ace_fold-widget:hover {
     border: 1px solid rgba(0, 0, 0, 0.3);
     background-color: rgba(255, 255, 255, 0.2);
-    border-radius: 3px;
     -moz-box-shadow:inset 0 1px 1px rgba(255, 255, 255, 0.7);
     -moz-box-shadow: 0 1px 1px rgba(255, 255, 255, 0.7);
     -webkit-box-shadow:inset 0 1px 1px rgba(255, 255, 255, 0.7);
@@ -257,3 +258,8 @@
     box-shadow:inset 0 1px 1px rgba(255, 255, 255);
     box-shadow: 0 1px 1px rgba(255, 255, 255, 0.8);
 }
+
+.ace_fold-widget.invalid {
+    background-color: #FFB4B4;
+    border-color: #DE5555;
+}
\ No newline at end of file
diff --git a/lib/ace/edit_session/folding.js b/lib/ace/edit_session/folding.js
index 5137800a..894524b9 100644
--- a/lib/ace/edit_session/folding.js
+++ b/lib/ace/edit_session/folding.js
@@ -706,6 +706,8 @@ function Folding() {
 
             if (addSubfolds)
                 this.foldAll(range.start.row + 1, range.end.row);
+        } else {
+            e.target.className += " invalid"
         }
     };