1294 Updated componentDidUpdate in Select to now set the scroll top t…

…o the previous option if it is disabled, it will show the disabled option even if it isn't focused.

JedWatson#1294

src/Select.js

@@ -207,9 +207,26 @@ const Select = React.createClass({
 	componentDidUpdate (prevProps, prevState) {
 		// focus to the selected option
 		if (this.menu && this.focused && this.state.isOpen && !this.hasScrolledToOption) {
-			let focusedOptionNode = ReactDOM.findDOMNode(this.focused);
 			let menuNode = ReactDOM.findDOMNode(this.menu);
-			menuNode.scrollTop = focusedOptionNode.offsetTop;
+			// Set Scroll Location of the Drop down.
+			// If focus is null or set to the first option
+			if(!this.focused || this.focused.props.optionIndex == 0){
+				// Set the menu scroll to the top.
+				menuNode.scrollTop = 0;
+			}else{
+				// Check the previous setting incase its 'disabled'
+				let previousOptionToFocused = this.props.options[this.focused.props.optionIndex - 1]
+				if (previousOptionToFocused && previousOptionToFocused.disabled){
+					// If the previous sibling is disabled, make the disabled option shown.
+					// on the drop down above the focused option.
+					let focusedNodesPreviousSibling = ReactDOM.findDOMNode(this.focused).previousSibling;
+					menuNode.scrollTop = focusedNodesPreviousSibling.offsetTop;
+				}else{
+					// Set the Top option on the drop down to be the focused option.
+					let focusedOptionNode = ReactDOM.findDOMNode(this.focused);
+					menuNode.scrollTop = focusedOptionNode.offsetTop;
+				}
+			}
 			this.hasScrolledToOption = true;
 		} else if (!this.state.isOpen) {
 			this.hasScrolledToOption = false;