optimize lastUsed

_server/css/editor.css

@@ -150,6 +150,13 @@ body {
     height: 416px;
 }
 
+#lastUsedDiv {
+    height: auto;
+    bottom: 0;
+    margin-top: 20px;
+    overflow: hidden;
+}
+
 #mid .tools {
     position: absolute;
     width: 425px;

_server/editor.js

@@ -406,7 +406,6 @@ editor.prototype.updateLastUsedMap = function () {
     ctx.lineWidth = 4;
     for (var i = 0; i < editor.uivalues.lastUsed.length; ++i) {
         var x = i % core.__SIZE__, y = parseInt(i / core.__SIZE__);
-        if (y >= 5) break;
         var info = editor.uivalues.lastUsed[i];
         if (!info || !info.images) continue;
         if (info.isTile) {