Repaint QProgressBar when minimum or maximum changed

The implementation of QProgressBar::setMinimum and setMaximum did not
repaint the widget. This caused the widget to be shown incorrectly in
case you call setMinimum or setMaximum but not setValue.

Task-number: QTBUG-22121
(cherry picked from commit b1998f4f59c3b10700963b2d13a17a0cc77ef665)

Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

Change-Id: I331d37ab4451d9e096cdf91a9e0a0286bc3cdffb
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/tests/auto/widgets/widgets/qprogressbar/tst_qprogressbar.cpp b/tests/auto/widgets/widgets/qprogressbar/tst_qprogressbar.cpp
index 55285b42ff..c05fdc4442 100644
--- a/tests/auto/widgets/widgets/qprogressbar/tst_qprogressbar.cpp
+++ b/tests/auto/widgets/widgets/qprogressbar/tst_qprogressbar.cpp
@@ -61,6 +61,7 @@ private slots:
     void text();
     void format();
     void setValueRepaint();
+    void setMinMaxRepaint();
     void sizeHint();
     void formatedText_data();
     void formatedText();
@@ -214,6 +215,44 @@ void tst_QProgressBar::setValueRepaint()
     }
 }
 
+void tst_QProgressBar::setMinMaxRepaint()
+{
+    ProgressBar pbar;
+    pbar.setMinimum(0);
+    pbar.setMaximum(10);
+    pbar.setFormat("%v");
+    pbar.show();
+    QTest::qWaitForWindowShown(&pbar);
+
+    QApplication::processEvents();
+
+    // No repaint when setting minimum to the current minimum
+    pbar.repainted = false;
+    pbar.setMinimum(0);
+    QTest::qWait(50);
+    QTRY_VERIFY(!pbar.repainted);
+
+    // No repaint when setting maximum to the current maximum
+    pbar.repainted = false;
+    pbar.setMaximum(10);
+    QTest::qWait(50);
+    QTRY_VERIFY(!pbar.repainted);
+
+    // Repaint when setting minimum
+    for (int i = 9; i >= 0; i--) {
+        pbar.repainted = false;
+        pbar.setMinimum(i);
+        QTRY_VERIFY(pbar.repainted);
+    }
+
+    // Repaint when setting maximum
+    for (int i = 0; i < 10; ++i) {
+        pbar.repainted = false;
+        pbar.setMaximum(i);
+        QTRY_VERIFY(pbar.repainted);
+    }
+}
+
 void tst_QProgressBar::sizeHint()
 {
     ProgressBar bar;