QmlDesigner: Fix validation on integer spinboxes

Now spinboxes use IntValidator if decimals is set to zero.

Fixes: QDS-11922
Change-Id: Ibe8c8a18294a6764a0cd2182d09c30cdf9fb27cc
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/StudioControls/RealSpinBox.qml

@@ -95,7 +95,7 @@ T.SpinBox {
             control.focus = false
     }
 
-    validator: DoubleValidator {
+    DoubleValidator {
         id: doubleValidator
         locale: control.locale.name
         notation: DoubleValidator.StandardNotation
@@ -104,6 +104,15 @@ T.SpinBox {
         top: Math.max(control.realFrom, control.realTo)
     }
 
+    IntValidator {
+        id: intValidator
+        locale: control.locale.name
+        bottom: Math.round(Math.min(control.realFrom, control.realTo))
+        top: Math.round(Math.max(control.realFrom, control.realTo))
+    }
+
+    validator: control.decimals === 0 ? intValidator : doubleValidator
+
     ActionIndicator {
         id: actionIndicator
         style: control.style
@@ -153,7 +162,7 @@ T.SpinBox {
         id: spinBoxInput
         style: control.style
         __parentControl: control
-        validator: doubleValidator
+        validator: control.validator
 
         function handleEditingFinished() {
             control.checkAndClearFocus()