Fix saving draft just after entering compose window (#1489012)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix saving draft just after entering compose window (#1489012)
 - Call resize handler in intervals to prevent lags and double onresize calls in Chrome (#1489005)
 - Fix javascript error in IE9 when loading form with placeholders into an iframe (#1489008)
 - Fix handling of some conditional comment tags in HTML message (#1489004)

program/js/app.js

@@ -985,8 +985,8 @@ function rcube_webmail()
         // Reset the auto-save timer
         clearTimeout(this.save_timer);
 
-        // compose form did not change
+        // compose form did not change (and draft wasn't saved already)
-        if (this.cmp_hash == this.compose_field_hash()) {
+        if (this.draft_saved && this.cmp_hash == this.compose_field_hash()) {
           this.auto_save_start();
           break;
         }
@@ -3302,6 +3302,7 @@ function rcube_webmail()
 
   this.set_draft_id = function(id)
   {
+    this.draft_saved = id;
     $("input[name='_draft_saveid']").val(id);
   };