do not set lastPos on render(true). remove old code.

README.md

@@ -139,6 +139,8 @@ The screen on which every other node renders.
   (not just full-width ones, elements with uniform cells to their sides).
   this is known to cause flickering with elements that are not full-width,
   however, it is more optimal for terminal rendering.
+- **resizeTimeout** - amount of time (in ms) to redraw the screen after the
+  terminal is resized (default: 300).
 
 ##### Properties:
 

lib/widget.js

@@ -2003,7 +2003,6 @@ Box.prototype.render = function(stop) {
 
   // TODO: Possibly do both shrinkBox and shrink
   // and use whichever values are higher.
-  // Slower than below, but more foolproof.
   if (this.options.shrinkBox && this.children.length) {
     xl = 0, yl = 0;
     for (i = 0; i < this.children.length; i++) {
@@ -2068,28 +2067,20 @@ Box.prototype.render = function(stop) {
     }
   }
 
-  // NOTE: Won't work because parent is rendered first.
-  //if (this.options.shrinkBox && this._lastPos) {
-  //  xl = this._lastPos.xl, yl = this._lastPos.yl;
-  //}
-
   // TODO:
   // Calculate whether we moved/resized by checking the previous _lastPos.
   // Maybe clear based on that. Possibly emit events here.
-  ret = this._lastPos = {
+  ret = {
     xi: xi_,
     xl: xl,
     yi: yi_,
-    yl: yl,
-    //mxl: xl,
-    //myl: yl
+    yl: yl
   };
 
-  //this.parent._lastPos.mxl = Math.max(this.parent._lastPos.mxl, xl);
-  //this.parent._lastPos.myl = Math.max(this.parent._lastPos.myl, yl);
-
   if (stop) return ret;
 
+  this._lastPos = ret;
+
   battr = this.border
     ? this.sattr(this.style.border, this.style.border.fg, this.style.border.bg)
     : 0;