RangeSlider: update handle positions when 'from' or 'to' value is changed

The RangeSlider's setTo() and setFrom() implementation was not updating
the positions of the handles. This patch fixes it and aligns the
behavior with the basic Slider.

This commit is cherry-picked from qtdeclarative repo of the dev branch,
because QuickControls2 were merged into that repo in Qt 6.

Fixes: QTBUG-98482
Change-Id: I482c416f91be2b97af1d922305dfe6fc1f5bd573
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
(cherry picked from commit 7ff266ff782b35817d3ecc1a08c3a54bd2c2aa88)

2 files changed, 45 insertions, 0 deletions

diff --git a/src/quicktemplates2/qquickrangeslider.cpp b/src/quicktemplates2/qquickrangeslider.cpp
index 7aee2109..25542fcc 100644
--- a/src/quicktemplates2/qquickrangeslider.cpp
+++ b/src/quicktemplates2/qquickrangeslider.cpp
@@ -665,6 +665,10 @@ void QQuickRangeSlider::setFrom(qreal from)
     if (isComponentComplete()) {
         d->first->setValue(d->first->value());
         d->second->setValue(d->second->value());
+        auto *firstPrivate = QQuickRangeSliderNodePrivate::get(d->first);
+        auto *secondPrivate = QQuickRangeSliderNodePrivate::get(d->second);
+        firstPrivate->updatePosition(true);
+        secondPrivate->updatePosition();
     }
 }
 
@@ -693,6 +697,10 @@ void QQuickRangeSlider::setTo(qreal to)
     if (isComponentComplete()) {
         d->first->setValue(d->first->value());
         d->second->setValue(d->second->value());
+        auto *firstPrivate = QQuickRangeSliderNodePrivate::get(d->first);
+        auto *secondPrivate = QQuickRangeSliderNodePrivate::get(d->second);
+        firstPrivate->updatePosition(true);
+        secondPrivate->updatePosition();
     }
 }
 
diff --git a/tests/auto/controls/data/tst_rangeslider.qml b/tests/auto/controls/data/tst_rangeslider.qml
index d645ec70..42f5bad5 100644
--- a/tests/auto/controls/data/tst_rangeslider.qml
+++ b/tests/auto/controls/data/tst_rangeslider.qml
@@ -159,6 +159,43 @@ TestCase {
         compare(control.first.position, 0.5)
     }
 
+    function test_setToFromUpdatesHandles() {
+        var control = createTemporaryObject(sliderComponent, testCase, { from: 0, to: 100, "first.value": 50, "second.value": 75 })
+        verify(control)
+
+        let firstPos = control.first.position
+        let secondPos = control.second.position
+
+        var firstPosChangesSpy = signalSpy.createObject(control, {target: control.first, signalName: "positionChanged"})
+        verify(firstPosChangesSpy.valid)
+
+        var secondPosChangesSpy = signalSpy.createObject(control, {target: control.second, signalName: "positionChanged"})
+        verify(secondPosChangesSpy.valid)
+
+        // Increasing the 'to' value, so the positions of the handles should be
+        // moved to the left (become smaller)
+        control.to = 200;
+        compare(firstPosChangesSpy.count, 1)
+        compare(secondPosChangesSpy.count, 1)
+        verify(control.first.position < firstPos)
+        verify(control.second.position < secondPos)
+
+        // resetting the values
+        control.to = 100
+        firstPosChangesSpy.clear()
+        secondPosChangesSpy.clear()
+        firstPos = control.first.position
+        secondPos = control.second.position
+
+        // Decreasing the 'from' value, so the positions of the handles should
+        // be moved to the right (become larger)
+        control.from = -100
+        compare(firstPosChangesSpy.count, 1)
+        compare(secondPosChangesSpy.count, 1)
+        verify(control.first.position > firstPos)
+        verify(control.second.position > secondPos)
+    }
+
     function test_setValues() {
         var control = createTemporaryObject(sliderComponent, testCase)
         verify(control)