Fix stylesheet crash.

Style sheets that refer to the progress bar (like
"QProgressDialog[maximum='0']{}") may dereference a
null-pointer during the styleHint() call in QProgressDialogPrivate::init()
since the progress bar has not been created yet.

Move the creation of the progress bar closer to the
top of init(), before the styleHint() call.

Change-Id: I31c3c1c346430fc9fe86b0977403dea0c0dc5e90
Task-number: QTBUG-43830
Reviewed-by: Andras Becsi <andras.becsi@theqtcompany.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/widgets/dialogs/qprogressdialog.cpp b/src/widgets/dialogs/qprogressdialog.cpp
index 01ca398a14..371949e768 100644
--- a/src/widgets/dialogs/qprogressdialog.cpp
+++ b/src/widgets/dialogs/qprogressdialog.cpp
@@ -108,10 +108,10 @@ void QProgressDialogPrivate::init(const QString &labelText, const QString &cance
 {
     Q_Q(QProgressDialog);
     label = new QLabel(labelText, q);
-    int align = q->style()->styleHint(QStyle::SH_ProgressDialog_TextLabelAlignment, 0, q);
-    label->setAlignment(Qt::Alignment(align));
     bar = new QProgressBar(q);
     bar->setRange(min, max);
+    int align = q->style()->styleHint(QStyle::SH_ProgressDialog_TextLabelAlignment, 0, q);
+    label->setAlignment(Qt::Alignment(align));
     autoClose = true;
     autoReset = true;
     forceHide = false;