In getting IE version, prefer Trident version over MSIE version. (#1726)

* In getting IE version, prefer Trident version over MSIE version.

* In getting IE version, revert preferring Trident version and check on documentMode instead.

* Added getieversion unit test.

shared/AppInsightsCommon/Tests/Unit/src/Util.tests.ts

@@ -531,8 +531,8 @@ export class UtilTests extends AITestClass {
                 }
 
                 Assert.equal(7, Util.getIEVersion("Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 6.0)"));
-                Assert.equal(7, Util.getIEVersion("Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; WOW64; Trident/4.0;)"));
                 Assert.equal(7, Util.getIEVersion("Mozilla/5.0 (compatible; MSIE 7.0; Windows NT 6.0; en-US)"));
+                Assert.equal(7, Util.getIEVersion("Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; WOW64; Trident/4.0;)"));
                 Assert.equal(8, Util.getIEVersion("Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)"));
                 Assert.equal(8, Util.getIEVersion("Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0)"));
                 Assert.equal(8, Util.getIEVersion("Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 1.0.3705; .NET CLR 1.1.4322)"));
@@ -546,7 +546,16 @@ export class UtilTests extends AITestClass {
                 Assert.equal(11, Util.getIEVersion("Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko"));
                 Assert.equal(11, Util.getIEVersion("Mozilla/5.0 (Windows NT 10.0; Trident/7.0; rv:11.0) like Gecko"));
                 Assert.equal(11, Util.getIEVersion("Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; AS; rv:11.0) like Gecko"));
+
+                const origDocMode = document['documentMode'];
+                document['documentMode'] = 11;
+ 
+                Assert.equal(11, Util.getIEVersion("Mozilla/4.0 (Compatible; MSIE 8.0; Windows NT 5.2; Trident/6.0)"));
+                Assert.equal(11, Util.getIEVersion("Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; Win64; x64; Trident/7.0; .NET4.0C; .NET4.0E)"));
+
+                // restore documentMode
+                document['documentMode'] = origDocMode;
             }
         });
     }
-}
+}

shared/AppInsightsCore/src/JavaScriptSDK/EnvUtils.ts

@@ -19,6 +19,7 @@ declare var XDomainRequest: any;
 
 const strWindow = "window";
 const strDocument = "document";
+const strDocumentMode = "documentMode";
 const strNavigator = "navigator";
 const strHistory = "history";
 const strLocation = "location";
@@ -311,8 +312,10 @@ export function getIEVersion(userAgentStr: string = null): number {
     }
 
     var ua = (userAgentStr || "").toLowerCase();
+    // Also check for documentMode in case X-UA-Compatible meta tag was included in HTML.
     if (strContains(ua, strMsie)) {
-        return parseInt(ua.split(strMsie)[1]);
+        let doc = getDocument() || {} as Document;
+        return Math.max(parseInt(ua.split(strMsie)[1]), (doc[strDocumentMode] || 0));
     } else if (strContains(ua, strTrident)) {
         let tridentVer = parseInt(ua.split(strTrident)[1]);
         if (tridentVer) {