Fix so drag-n-drop of text (e.g. recipient addresses) on compose page actually works (#1490619)

Conflicts:

	program/js/app.js

CHANGELOG

@@ -7,6 +7,7 @@ CHANGELOG Roundcube Webmail
 - Fix handling of message/rfc822 attachments on replies and forwards (#1490607)
 - Fix PDF support detection in Firefox > 19 (#1490610)
 - Fix path traversal vulnerability in setting a skin (#1490620)
+- Fix so drag-n-drop of text (e.g. recipient addresses) on compose page actually works (#1490619)
 
 RELEASE 1.0.7
 -------------

program/js/app.js

@@ -7248,8 +7248,8 @@ function rcube_webmail()
   // html5 file-drop API
   this.document_drag_hover = function(e, over)
   {
-    e.preventDefault();
-    $(ref.gui_objects.filedrop)[(over?'addClass':'removeClass')]('active');
+    // don't e.preventDefault() here to not block text dragging on the page (#1490619)
+    $(this.gui_objects.filedrop)[(over?'addClass':'removeClass')]('active');
   };
 
   this.file_drag_hover = function(e, over)