Make tile vm support disambiguation

Signed-off-by: RMidhunSuresh <rmidhunsuresh@gmail.com>

src/domain/session/rightpanel/MemberTileViewModel.js

@@ -4,19 +4,47 @@ export class MemberTileViewModel extends ViewModel {
     constructor(options) {
         super(options);
         this._member = this._options.member;
-        this._shouldDisambiguate = options.shouldDisambiguate;
+        this._previousName = null;
+        this._nameChanged = true;
     }
 
     get name() {
-        return this._member.name;
+        return `${this._member.name}${this._disambiguationPart}`;
+    }
+
+    get _disambiguationPart() {
+        return this._disambiguate ? ` (${this.userId})` : "";
     }
 
     get userId() {
         return this._member.userId;
     }
 
-    updateFrom(newMember) {
+    get previousName() {
-        this._member = newMember;
+        return this._previousName;
     }
 
+    get nameChanged() {
+        return this._nameChanged;
+    }
+
+    _updatePreviousName(newName) {
+        const currentName = this._member.name;
+        if (currentName !== newName) {
+            this._previousName = currentName;
+            this._nameChanged = true;
+        } else {
+            this._nameChanged = false;
+        }
+    }
+
+    setDisambiguation(status) {
+        this._disambiguate = status;
+        this.emitChange();
+    }
+
+    updateFrom(newMember) {
+        this._updatePreviousName(newMember.name);
+        this._member = newMember;
+    }
 }