[IMP] standaloneComposer: show invalid border when invalid

Task: 4645937

Author: fdamhaut

src/components/composer/standalone_composer/standalone_composer.ts

@@ -94,7 +94,7 @@ export class StandaloneComposer extends Component<Props, SpreadsheetChildEnv> {
   get containerClass(): string {
     const classes = [
       this.focus === "inactive" ? "" : "active",
-      this.props.invalid ? "o-invalid" : "",
+      this.props.invalid ? "o-invalid" : "border-bottom",
       this.props.class || "",
     ];
     return classes.join(" ");

src/components/composer/standalone_composer/standalone_composer.xml

@@ -1,7 +1,7 @@
 <templates>
   <t t-name="o-spreadsheet-StandaloneComposer">
     <div
-      class="o-standalone-composer border-bottom"
+      class="o-standalone-composer"
       t-on-click.stop=""
       t-att-class="containerClass"
       t-att-title="props.title">