Make the non-native TabWidget fill the parent size when not in layout

Fix #2683

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to this project are documented in this file.
 
  - Fixed missing items compilation error in the generated code related to public functions (#2655).
  - Added support for Window transparency on supported platform
+ - Fixed TabWidget not filling the parent in non-native style
 
 ### Slint Language
 

internal/compiler/widgets/fluent-base/std-widgets-base.slint

@@ -337,7 +337,7 @@ export component GroupBox {
     }
 }
 
-export component TabWidgetImpl  {
+export component TabWidgetImpl inherits Rectangle {
     out property <length> content-x: 0;
     out property <length> content-y: root.tabbar-preferred-height;
     out property <length> content-height: root.height - root.tabbar-preferred-height;

internal/compiler/widgets/material-base/widget-tabwidget.slint

@@ -4,7 +4,7 @@
 
 import { md } from "md.slint";
 
-export component TabWidgetImpl {
+export component TabWidgetImpl inherits Rectangle {
     out property <length> content-x: 0;
     out property <length> content-y: root.tabbar-preferred-height;
     out property <length> content-height: root.height - root.tabbar-preferred-height;