comments for suppressDelta and indentationOnLastIndentedLine

Author: saschanaz

src/services/formatting/formatting.ts

@@ -1,4 +1,4 @@
-///<reference path='..\services.ts' />
+///<reference path='..\services.ts' />
 ///<reference path='formattingScanner.ts' />
 ///<reference path='rulesProvider.ts' />
 ///<reference path='references.ts' />
@@ -542,6 +542,16 @@ namespace ts.formatting {
                         }
                     }
                     if (suppressDelta) {
+                        // if list end token is LessThanToken '>' then its delta should be explicitly suppressed
+                        // so that LessThanToken as a binary operator can still be indented.
+                        // foo.then
+                        //     <
+                        //         number,
+                        //         string,
+                        //     >();
+                        // vs 
+                        // var a = xValue
+                        //     > yValue;
                         return indentation;
                     }
                     else {
@@ -722,6 +732,10 @@ namespace ts.formatting {
                             consumeTokenAndAdvanceScanner(tokenInfo, parent, parentDynamicIndentation, parent);
 
                             if (indentationOnLastIndentedLine !== Constants.Unknown) {
+                                // scanner just processed list start token so consider last indentation as list indentation
+                                // function foo(): { // last indentation was 0, list item will be indented based on this value
+                                //   foo: number;
+                                // }: {};
                                 indentationOnListStartToken = indentationOnLastIndentedLine;
                             }
                             else {