QObject: restore flags printing in dumpObjectTree()

This was lost when QtCore, QtGui and QtWidgets were split up. Restored
now via a virtual function on QObjectPrivate.

Chose to return std::string instead of QString or QByteArray because
its SSO is usually sufficient to hold these flag strings.

[ChangeLog][QtCore][QObject] Restored printing of Qt3-style
information from dumpObjectTree().

[ChangeLog][QtWidgets][QWidget] Restored printing of Qt3-style
information from QWidget::dumpObjectTree().

Fixes: QTBUG-101732
Change-Id: I39ff5728ea5f5abbdbf81b5d7e13b8d16b6ee8b7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 3918a46da4..97a02899f8 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -110,6 +110,8 @@
 
 #include "qwindowcontainer_p.h"
 
+#include <sstream>
+
 // widget/widget data creation count
 //#define QWIDGET_EXTRA_DEBUG
 //#define ALIEN_DEBUG
@@ -12961,6 +12963,25 @@ void QWidgetPrivate::setWidgetParentHelper(QObject *widgetAsObject, QObject *new
     widget->setParent(static_cast<QWidget*>(newParent));
 }
 
+std::string QWidgetPrivate::flagsForDumping() const
+{
+    Q_Q(const QWidget);
+    std::string flags = QObjectPrivate::flagsForDumping();
+    if (QApplication::focusWidget() == q)
+        flags += 'F';
+    if (q->isVisible()) {
+        std::stringstream s;
+        s << '<'
+          << q->width() << 'x' << q->height()
+          << std::showpos << q->x() << q->y()
+          << '>';
+        flags += s.str();
+    } else {
+        flags += 'I';
+    }
+    return flags;
+}
+
 void QWidgetPrivate::setNetWmWindowTypes(bool skipIfMissing)
 {
 #if QT_CONFIG(xcb)