Add QWidgetPrivate::isExplicitlyHidden() helper function

To aid readability.

Task-number: QTBUG-121398
Change-Id: I3cb231584c2b7aee72e9f01c669fed1e01fbe475
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
(cherry picked from commit 4634fbf34e1674846e1666bcdb3055f82e3096b0)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/widgets/kernel/qlayout.cpp

@@ -772,7 +772,7 @@ void QLayoutPrivate::reparentChildWidgets(QWidget *mw)
                          w->metaObject()->className(), qUtf16Printable(w->objectName()));
             }
 #endif
-            bool needShow = mwVisible && !(w->isHidden() && w->testAttribute(Qt::WA_WState_ExplicitShowHide));
+            bool needShow = mwVisible && !QWidgetPrivate::get(w)->isExplicitlyHidden();
             if (pw != mw)
                 w->setParent(mw);
             if (needShow)
@@ -858,7 +858,7 @@ void QLayout::addChildWidget(QWidget *w)
 #endif
         pw = nullptr;
     }
-    bool needShow = mw && mw->isVisible() && !(w->isHidden() && w->testAttribute(Qt::WA_WState_ExplicitShowHide));
+    bool needShow = mw && mw->isVisible() && !QWidgetPrivate::get(w)->isExplicitlyHidden();
     if (!pw && mw)
         w->setParent(mw);
     w->setAttribute(Qt::WA_LaidOut);

src/widgets/kernel/qwidget.cpp

@@ -8439,10 +8439,16 @@ void QWidget::setHidden(bool hidden)
     setVisible(!hidden);
 }
 
+bool QWidgetPrivate::isExplicitlyHidden() const
+{
+    Q_Q(const QWidget);
+    return q->isHidden() && q->testAttribute(Qt::WA_WState_ExplicitShowHide);
+}
+
 void QWidgetPrivate::_q_showIfNotHidden()
 {
     Q_Q(QWidget);
-    if ( !(q->isHidden() && q->testAttribute(Qt::WA_WState_ExplicitShowHide)) )
+    if (!isExplicitlyHidden())
         q->setVisible(true);
 }
 
@@ -10903,7 +10909,7 @@ void QWidgetPrivate::setParent_sys(QWidget *newparent, Qt::WindowFlags f)
             targetScreen = q->parentWidget()->window()->screen();
     }
 
-    bool explicitlyHidden = q->testAttribute(Qt::WA_WState_Hidden) && q->testAttribute(Qt::WA_WState_ExplicitShowHide);
+    bool explicitlyHidden = isExplicitlyHidden();
 
     // Reparenting toplevel to child
     if (wasCreated && !(f & Qt::Window) && (oldFlags & Qt::Window) && !q->testAttribute(Qt::WA_NativeWindow)) {

src/widgets/kernel/qwidget_p.h

@@ -379,6 +379,7 @@ public:
     void show_sys();
     void hide_sys();
     void hide_helper();
+    bool isExplicitlyHidden() const;
     void _q_showIfNotHidden();
     void setVisible(bool);
 

src/widgets/kernel/qwidgetaction.cpp

@@ -5,6 +5,8 @@
 #include "qwidget.h"
 #include "qdebug.h"
 
+#include <QtWidgets/private/qwidget_p.h>
+
 #include "qwidgetaction_p.h"
 
 QT_BEGIN_NAMESPACE
@@ -108,7 +110,7 @@ void QWidgetAction::setDefaultWidget(QWidget *widget)
     if (!widget)
         return;
 
-    setVisible(!(widget->isHidden() && widget->testAttribute(Qt::WA_WState_ExplicitShowHide)));
+    setVisible(!QWidgetPrivate::get(widget)->isExplicitlyHidden());
     d->defaultWidget->hide();
     d->defaultWidget->setParent(nullptr);
     d->defaultWidgetInUse = false;

src/widgets/widgets/qsizegrip.cpp

@@ -75,7 +75,7 @@ public:
     void _q_showIfNotHidden()
     {
         Q_Q(QSizeGrip);
-        bool showSizeGrip = !(q->isHidden() && q->testAttribute(Qt::WA_WState_ExplicitShowHide));
+        bool showSizeGrip = !isExplicitlyHidden();
         updateTopLevelWidget();
         if (tlw && showSizeGrip) {
             Qt::WindowStates sizeGripNotVisibleState = Qt::WindowFullScreen;
@@ -451,7 +451,7 @@ void QSizeGrip::setVisible(bool visible)
 bool QSizeGrip::eventFilter(QObject *o, QEvent *e)
 {
     Q_D(QSizeGrip);
-    if ((isHidden() && testAttribute(Qt::WA_WState_ExplicitShowHide))
+    if (d->isExplicitlyHidden()
         || e->type() != QEvent::WindowStateChange
         || o != d->tlw) {
         return QWidget::eventFilter(o, e);

src/widgets/widgets/qsplitter.cpp

@@ -709,7 +709,7 @@ void QSplitterPrivate::setSizes_helper(const QList<int> &sizes, bool clampNegati
 bool QSplitterPrivate::shouldShowWidget(const QWidget *w) const
 {
     Q_Q(const QSplitter);
-    return q->isVisible() && !(w->isHidden() && w->testAttribute(Qt::WA_WState_ExplicitShowHide));
+    return q->isVisible() && !QWidgetPrivate::get(w)->isExplicitlyHidden();
 }
 
 void QSplitterPrivate::setGeo(QSplitterLayoutStruct *sls, int p, int s, bool allowCollapse)

src/widgets/widgets/qstatusbar.cpp

@@ -271,7 +271,7 @@ int QStatusBar::insertWidget(int index, QWidget *widget, int stretch)
         widget->hide();
 
     reformat();
-    if (!widget->isHidden() || !widget->testAttribute(Qt::WA_WState_ExplicitShowHide))
+    if (!QWidgetPrivate::get(widget)->isExplicitlyHidden())
         widget->show();
 
     return index;
@@ -332,7 +332,7 @@ int QStatusBar::insertPermanentWidget(int index, QWidget *widget, int stretch)
     d->items.insert(index, item);
 
     reformat();
-    if (!widget->isHidden() || !widget->testAttribute(Qt::WA_WState_ExplicitShowHide))
+    if (!QWidgetPrivate::get(widget)->isExplicitlyHidden())
         widget->show();
 
     return index;