ProjectExplorer: Avoid accidental changes on spinbox via mouse scroll

- Introduced an Utils::attachWheelBlocker() to disable mouse wheel events on the "Parallel Jobs" field.
- This prevents unintentional modifications when users inadvertently scroll over the input.

Change-Id: Iccb93305fbcf399cae683412078782b5ea9f4ad6
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/libs/utils/CMakeLists.txt

@@ -69,6 +69,7 @@ add_qtc_library(Utils
     genericconstants.h
     globalfilechangeblocker.cpp globalfilechangeblocker.h
     guard.cpp guard.h
+    guiutils.cpp guiutils.h
     headerviewstretcher.cpp headerviewstretcher.h
     highlightingitemdelegate.cpp highlightingitemdelegate.h
     historycompleter.cpp historycompleter.h

src/libs/utils/aspects.cpp

@@ -7,6 +7,7 @@
 #include "checkablemessagebox.h"
 #include "environment.h"
 #include "fancylineedit.h"
+#include "guiutils.h"
 #include "iconbutton.h"
 #include "layoutbuilder.h"
 #include "passworddialog.h"
@@ -2195,6 +2196,7 @@ void IntegerAspect::addToLayout(Layouting::LayoutItem &parent)
         d->m_spinBox->setRange(int(d->m_minimumValue.value() / d->m_displayScaleFactor),
                                int(d->m_maximumValue.value() / d->m_displayScaleFactor));
     d->m_spinBox->setValue(int(value() / d->m_displayScaleFactor)); // Must happen after setRange()
+    attachWheelBlocker(d->m_spinBox);
     addLabeledItem(parent, d->m_spinBox);
     connect(d->m_spinBox.data(), &QSpinBox::valueChanged,
             this, &IntegerAspect::handleGuiChanged);
@@ -2294,6 +2296,7 @@ void DoubleAspect::addToLayout(LayoutItem &builder)
     d->m_spinBox->setSpecialValueText(d->m_specialValueText);
     if (d->m_maximumValue && d->m_maximumValue)
         d->m_spinBox->setRange(d->m_minimumValue.value(), d->m_maximumValue.value());
+    attachWheelBlocker(d->m_spinBox);
     bufferToGui(); // Must happen after setRange()!
     addLabeledItem(builder, d->m_spinBox);
     connect(d->m_spinBox.data(), &QDoubleSpinBox::valueChanged,

src/libs/utils/guiutils.cpp

@@ -0,0 +1,34 @@
+// Copyright (C) 2023 Tasuku Suzuki <tasuku.suzuki@signal-slot.co.jp>
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "guiutils.h"
+
+#include <QEvent>
+#include <QWidget>
+
+namespace Utils {
+
+namespace Internal {
+
+class WheelEventFilter : public QObject
+{
+public:
+    bool eventFilter(QObject *watched, QEvent *event) override {
+        auto widget = qobject_cast<QWidget *>(watched);
+        return event->type() == QEvent::Wheel
+               && widget
+               && widget->focusPolicy() != Qt::WheelFocus
+               && !widget->hasFocus();
+    }
+};
+
+} // namespace Internal
+
+void QTCREATOR_UTILS_EXPORT attachWheelBlocker(QWidget *widget)
+{
+    static Internal::WheelEventFilter instance;
+    widget->installEventFilter(&instance);
+    widget->setFocusPolicy(Qt::StrongFocus);
+}
+
+} // namespace Utils

src/libs/utils/guiutils.h

@@ -0,0 +1,14 @@
+// Copyright (C) 2023 Tasuku Suzuki <tasuku.suzuki@signal-slot.co.jp>
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "utils_global.h"
+
+class QWidget;
+
+namespace Utils {
+
+void QTCREATOR_UTILS_EXPORT attachWheelBlocker(QWidget *widget);
+
+} // namespace Utils

src/plugins/help/generalsettingspage.cpp

@@ -18,6 +18,7 @@
 
 #include <utils/algorithm.h>
 #include <utils/fileutils.h>
+#include <utils/guiutils.h>
 #include <utils/layoutbuilder.h>
 
 #include <QCheckBox>
@@ -105,6 +106,7 @@ GeneralSettingsPageWidget::GeneralSettingsPageWidget()
     zoomSpinBox->setSingleStep(10);
     zoomSpinBox->setValue(100);
     zoomSpinBox->setSuffix(Tr::tr("%"));
+    attachWheelBlocker(zoomSpinBox);
     antialiasCheckBox = new QCheckBox(Tr::tr("Antialias"));
 
     auto fontGroupBox = new QGroupBox(Tr::tr("Font"));