fix: trigger shell layout and SWT.Activate on open in web mode

Author: piabedinicrocci

swt_native/src/web/java/org/eclipse/swt/widgets/DartShell.java

@@ -955,6 +955,9 @@ public void open() {
         }
         bringToTop(false);
         setWindowVisible(true, true);
+        if (isDisposed())
+            return;
+        sendEvent(SWT.Activate);
         if (isDisposed())
             return;
         if (!restoreFocus() && !traverseGroup(true)) {

swt_native/src/web/java/org/eclipse/swt/widgets/SwtFlutterBridge.java

@@ -188,7 +188,6 @@ public boolean hasFocus(DartControl widget) {
     public void setVisible(DartControl control, boolean visible) {
         if (control instanceof DartShell dartShell) {
             Shell shell = (Shell) dartShell.getApi();
-            boolean resizedToDisplayBounds = false;
             if (visible && forDisplay != null) {
                 if (shouldTrackDisplayBounds(shell)) {
                     Rectangle displayBounds = forDisplay.bounds;
@@ -199,11 +198,10 @@ public void setVisible(DartControl control, boolean visible) {
                             && shellBounds.width < displayBounds.width
                             && shellBounds.height < displayBounds.height) {
                         shell.setBounds(0, 0, displayBounds.width, displayBounds.height);
-                        resizedToDisplayBounds = true;
                     }
                 }
             }
-            if (resizedToDisplayBounds) {
+            if (visible) {
                 shell.layout(true, true);
             }
             sendDisplayUpdate(forDisplay);