QTextEdit::inputMethodQuery(): Preserve types when applying offset.

The old code converted QRectF into QRect when applying the offset. Change
the offset point to QPointF and change the conversions accordingly. Add an
autotest similar to that of QPlainTextEdit.

This minimizes rounding errors and prevents conversions since
the input method logic mostly uses qreal.

Task-number: QTBUG-51923
Change-Id: I0c2f80ccae028d8bbbb97ec603f8782f69959c76
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

2 files changed, 18 insertions, 5 deletions

diff --git a/src/widgets/widgets/qtextedit.cpp b/src/widgets/widgets/qtextedit.cpp
index 7439005b92..95f0bc7c59 100644
--- a/src/widgets/widgets/qtextedit.cpp
+++ b/src/widgets/widgets/qtextedit.cpp
@@ -1726,15 +1726,15 @@ QVariant QTextEdit::inputMethodQuery(Qt::InputMethodQuery query, QVariant argume
         break;
     default:
         v = d->control->inputMethodQuery(query, argument);
-        const QPoint offset(-d->horizontalOffset(), -d->verticalOffset());
+        const QPointF offset(-d->horizontalOffset(), -d->verticalOffset());
         if (v.type() == QVariant::RectF)
-            v = v.toRectF().toRect().translated(offset);
+            v = v.toRectF().translated(offset);
         else if (v.type() == QVariant::PointF)
-            v = v.toPointF().toPoint() + offset;
+            v = v.toPointF() + offset;
         else if (v.type() == QVariant::Rect)
-            v = v.toRect().translated(offset);
+            v = v.toRect().translated(offset.toPoint());
         else if (v.type() == QVariant::Point)
-            v = v.toPoint() + offset;
+            v = v.toPoint() + offset.toPoint();
     }
 
     return v;
diff --git a/tests/auto/widgets/widgets/qtextedit/tst_qtextedit.cpp b/tests/auto/widgets/widgets/qtextedit/tst_qtextedit.cpp
index 0cc812cbca..b81e4df123 100644
--- a/tests/auto/widgets/widgets/qtextedit/tst_qtextedit.cpp
+++ b/tests/auto/widgets/widgets/qtextedit/tst_qtextedit.cpp
@@ -191,6 +191,7 @@ private slots:
     void inputMethodQuery();
     void inputMethodQueryImHints_data();
     void inputMethodQueryImHints();
+    void inputMethodCursorRect();
 
     void highlightLongLine();
 
@@ -2473,6 +2474,18 @@ void tst_QTextEdit::inputMethodQueryImHints()
     QCOMPARE(static_cast<Qt::InputMethodHints>(value.toInt()), hints);
 }
 
+// QTBUG-51923: Verify that the cursor rectangle returned by the input
+// method query correctly reflects the viewport offset.
+void tst_QTextEdit::inputMethodCursorRect()
+{
+    ed->setPlainText("Line1\nLine2Line3\nLine3");
+    ed->moveCursor(QTextCursor::End);
+    const QRectF cursorRect = ed->cursorRect();
+    const QVariant cursorRectV = ed->inputMethodQuery(Qt::ImCursorRectangle);
+    QCOMPARE(cursorRectV.type(), QVariant::RectF);
+    QCOMPARE(cursorRectV.toRect(), cursorRect.toRect());
+}
+
 void tst_QTextEdit::highlightLongLine()
 {
     QTextEdit edit;