Update cursor position when selection is reversed.

A reversed selection will have the same resolved start and end
positions but a different cursor position so testing the end points
alone doesn't guarantee the selection is the same.

Task-number: QTBUG-19456
Reviewed-by: Martin Jones

Change-Id: I516e5a501ec878d673f21e54d688fd2d21b624ef
Reviewed-on: http://codereview.qt.nokia.com/2080
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Andrew den Exter <andrew.den-exter@nokia.com>

2 files changed, 19 insertions, 7 deletions

diff --git a/src/gui/widgets/qlinecontrol.cpp b/src/gui/widgets/qlinecontrol.cpp
index 84674a51d3..550b5cf947 100644
--- a/src/gui/widgets/qlinecontrol.cpp
+++ b/src/gui/widgets/qlinecontrol.cpp
@@ -281,27 +281,27 @@ void QLineControl::setSelection(int start, int length)
     }
 
     if (length > 0) {
-        if (start == m_selstart && start + length == m_selend)
-            return;
+        m_selDirty |= (start != m_selstart || start + length != m_selend);
         m_selstart = start;
         m_selend = qMin(start + length, (int)m_text.length());
         m_cursor = m_selend;
     } else if (length < 0){
-        if (start == m_selend && start + length == m_selstart)
-            return;
+        m_selDirty |= (start != m_selend || start + length != m_selstart);
         m_selstart = qMax(start + length, 0);
         m_selend = start;
         m_cursor = m_selstart;
     } else if (m_selstart != m_selend) {
+        m_selDirty = true;
         m_selstart = 0;
         m_selend = 0;
         m_cursor = start;
     } else {
         m_cursor = start;
-        emitCursorPositionChanged();
-        return;
     }
-    emit selectionChanged();
+    if (m_selDirty) {
+        m_selDirty = false;
+        emit selectionChanged();
+    }
     emitCursorPositionChanged();
 }
 
diff --git a/tests/auto/qlineedit/tst_qlineedit.cpp b/tests/auto/qlineedit/tst_qlineedit.cpp
index d178e26476..72b402f69d 100644
--- a/tests/auto/qlineedit/tst_qlineedit.cpp
+++ b/tests/auto/qlineedit/tst_qlineedit.cpp
@@ -289,6 +289,8 @@ private slots:
     void bidiLogicalMovement_data();
     void bidiLogicalMovement();
 
+    void selectAndCursorPosition();
+
 protected slots:
     void editingFinished();
 
@@ -3871,5 +3873,15 @@ void tst_QLineEdit::bidiLogicalMovement()
     } while (moved && i >= 0);
 }
 
+void tst_QLineEdit::selectAndCursorPosition()
+{
+    testWidget->setText("This is a long piece of text");
+
+    testWidget->setSelection(0, 5);
+    QCOMPARE(testWidget->cursorPosition(), 5);
+    testWidget->setSelection(5, -5);
+    QCOMPARE(testWidget->cursorPosition(), 0);
+}
+
 QTEST_MAIN(tst_QLineEdit)
 #include "tst_qlineedit.moc"