Only in ..\opacityd6: .project
diff -urp ..\opacityd6_old/misc/textarea.js ..\opacityd6/misc/textarea.js
--- ..\opacityd6_old/misc/textarea.js	2008-01-17 19:31:56.000000000 +0100
+++ ..\opacityd6/misc/textarea.js	2010-06-23 17:39:18.312808900 +0200
@@ -18,7 +18,7 @@ Drupal.behaviors.textarea = function(con
 
     function startDrag(e) {
       staticOffset = textarea.height() - e.pageY;
-      textarea.css('opacity', 0.25);
+      textarea.addClass('dragging');
       $(document).mousemove(performDrag).mouseup(endDrag);
       return false;
     }
@@ -30,7 +30,7 @@ Drupal.behaviors.textarea = function(con
 
     function endDrag(e) {
       $(document).unbind("mousemove", performDrag).unbind("mouseup", endDrag);
-      textarea.css('opacity', 1);
+      textarea.removeClass('dragging');
     }
   });
 };
diff -urp ..\opacityd6_old/modules/system/system.css ..\opacityd6/modules/system/system.css
--- ..\opacityd6_old/modules/system/system.css	2008-01-09 09:56:40.000000000 +0100
+++ ..\opacityd6/modules/system/system.css	2010-06-23 17:41:27.746808900 +0200
@@ -359,6 +359,9 @@ html.js .resizable-textarea textarea {
   width: 100%;
   display: block;
 }
+html.js .resizable-textarea textarea.dragging {
+  opacity: 0.25;
+}
 
 /*
 ** Table drag and drop.
Only in ..\opacityd6: opacityd6.patch
Only in ..\opacityd6/sites/default: files
Only in ..\opacityd6/sites/default: settings.php