Merge pull request embarklabs#5 from kylefleming/master

Fix scroll performance for widgets with huge content

lib/widgets/element.js

@@ -530,7 +530,8 @@ Element.prototype._parseAttr = function(lines) {
     , j
     , c;
 
-  if (lines[0].attr === attr) {
+  if (Array.isArray(lines.attr) && lines.attr.length > 0
+      && lines.attr[0] === attr) {
     return;
   }
 

test/widget-huge-content.js

@@ -0,0 +1,45 @@
+var blessed = require('../')
+  , screen;
+
+screen = blessed.screen({
+  dump: __dirname + '/logs/huge-content.log',
+  smartCSR: true,
+  warnings: true
+});
+
+var content = '';
+for (var j = 0; j < 2000; j++) {
+  for (var i = 0; i < 100; i++) {
+    content += 'line: ' + i + '\n';
+  }
+  for (var i = 0; i < 10000; i++) {
+    content += 'longline';
+  }
+  content += '\n';
+}
+
+var box = blessed.box({
+  parent: screen,
+  scrollable: true,
+  left: 'center',
+  top: 'center',
+  width: '80%',
+  height: '80%',
+  border: 'line',
+  content: content,
+  keys: true,
+  vi: true,
+  alwaysScroll: true,
+  scrollbar: {
+    ch: ' ',
+    inverse: true
+  }
+});
+
+screen.key('q', function() {
+  return screen.destroy();
+});
+
+box.focus();
+
+screen.render();