fix(radio): ngModelChange fires multiple times

Author: simeonoff

projects/igniteui-angular/src/lib/radio/radio.component.ts

@@ -317,10 +317,15 @@ export class IgxRadioComponent implements ControlValueAccessor, EditorProvider {
             this.nativeRadio.nativeElement.blur();
         }
 
-        this.checked = true;
-        this.focused = false;
-        this.change.emit({ value: this.value, radio: this });
-        this._onChangeCallback(this.value);
+        if(this.focused) {
+            this.focused = false;
+        }
+
+        if(!this.checked) {
+            this.checked = true;
+            this.change.emit({ value: this.value, radio: this });
+            this._onChangeCallback(this.value);
+        }
     }
 
     /**