UI: Fixed legend on update

ui-ngx/src/app/modules/home/components/widget/lib/flot-widget.component.scss

@@ -0,0 +1,24 @@
+/**
+ * Copyright © 2016-2023 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+:host ::ng-deep {
+  .flot-base, .flot-overlay {
+    width: 100% !important;
+    height: 100% !important;
+  }
+}
+

ui-ngx/src/app/modules/home/components/widget/lib/flot-widget.component.ts

@@ -30,7 +30,7 @@ import { isDefinedAndNotNull } from '@core/utils';
 @Component({
   selector: 'tb-flot-widget',
   templateUrl: './flot-widget.component.html',
-  styleUrls: []
+  styleUrls: ['./flot-widget.component.scss']
 })
 export class FlotWidgetComponent implements OnInit {
 

ui-ngx/src/app/modules/home/components/widget/lib/flot-widget.ts

@@ -1058,7 +1058,9 @@ export class TbFlot {
       const series = this.subscription.data[i] as TbFlotSeries;
       this.substituteLabelPatterns(series, i);
     }
-    this.updateData();
+    if (this.plot) {
+      this.updateData();
+    }
     this.ctx.detectChanges();
   }