Filtering out 2 other test case related fields that do not contain HTML.

Author: Sedeniono

src/HistoryDiffPageScript.js

@@ -921,8 +921,22 @@ function GetDiffFromUpdatedField(fieldsPropertiesMap, fieldReferenceName, value)
         // TODO: Can we still show a meaningful proper diff?
         // https://devblogs.microsoft.com/devops/how-to-use-test-step-using-rest-client-helper/
         // https://oshamrai.wordpress.com/2019/05/11/azure-devops-services-rest-api-14-create-and-add-test-cases-2/
+        // ADO probably parses it in TestBase.getTestStepsInternal() in TestManagement\Scripts\TFS.TestManagement.js.
         return '(Showing the diff of test case steps is not supported.)';
     }
+    else if (fieldReferenceName === 'Microsoft.VSTS.TCM.Parameters') {
+        // This field is used in 'shared parameter set' work items, which are work items that can be referenced by test case items.
+        // https://learn.microsoft.com/en-us/azure/devops/test/repeat-test-with-different-data?view=azure-devops#share-parameters-between-test-cases
+        // The field type is reported as 'gFieldTypeEnum.Html', although in reality it is some general XML. For example:
+        //    "<parameterSet><paramNames><param>someVar</param><param>var</param></paramNames><paramData lastId=\"1\"><dataRow id=\"1\"><kvp key=\"someVar\" value=\"test value\"/><kvp key=\"var\" value=\"another value\"/></dataRow></paramData></parameterSet>"
+        return '(Showing the diff of a shared parameter set is not supported.)';
+    }
+    else if (fieldReferenceName === 'Microsoft.VSTS.TCM.LocalDataSource') {
+        // Similar to the two cases above, this field is used in test case work items. It contains parameter values. And as the 
+        // other fields, it is reported to contain HTML, which is again a lie. For local parameters it is again some XML string. 
+        // Insidiously, for shared parameters it seems to contain data in JSON.
+        return '(Showing the diff of parameter values is not supported.)';
+    }
 
     // Azure DevOps (at least 2019) reports identities (e.g. the 'System.CreatedBy' field) as 'gFieldTypeEnum.String', but the 'isIdentity' flag is set.
     // An identity is probably an 'IdentityReference': https://learn.microsoft.com/en-us/javascript/api/azure-devops-extension-api/identityreference

vss-extension.json

@@ -2,7 +2,7 @@
     "manifestVersion": 1,
     "id": "HistoryDiff",
     "publisher": "Sedenion",
-    "version": "1.3.0.0",
+    "version": "1.3.0.3",
     "name": "History Diff",
     "description": "Azure DevOps extension to show the history of work item fields with proper diffs.",
     "public": true,