QLineEdit: add support for Qt::ImAnchorRectangle

Change-Id: I52e15aa40af5ff77306c43209af87a3e727d2bdb
Reviewed-by: Jan Arve Sæther <jan-arve.saether@theqtcompany.com>

src/widgets/widgets/qlineedit.cpp

@@ -1758,6 +1758,8 @@ QVariant QLineEdit::inputMethodQuery(Qt::InputMethodQuery property, QVariant arg
     switch(property) {
     case Qt::ImCursorRectangle:
         return d->cursorRect();
+    case Qt::ImAnchorRectangle:
+        return d->adjustedControlRect(d->control->anchorRect());
     case Qt::ImFont:
         return font();
     case Qt::ImCursorPosition: {

src/widgets/widgets/qwidgetlinecontrol.cpp

@@ -404,6 +404,23 @@ int QWidgetLineControl::xToPos(int x, QTextLine::CursorPosition betweenOrOn) con
     return textLayout()->lineAt(0).xToCursor(x, betweenOrOn);
 }
 
+/*!
+    \internal
+
+    Returns the bounds of the given text position.
+*/
+QRect QWidgetLineControl::rectForPos(int pos) const
+{
+    QTextLine l = textLayout()->lineAt(0);
+    if (m_preeditCursor != -1)
+        pos += m_preeditCursor;
+    int cix = qRound(l.cursorToX(pos));
+    int w = m_cursorWidth;
+    int ch = l.height() + 1;
+
+    return QRect(cix-5, 0, w+9, ch);
+}
+
 /*!
     \internal
 
@@ -412,15 +429,19 @@ int QWidgetLineControl::xToPos(int x, QTextLine::CursorPosition betweenOrOn) con
 */
 QRect QWidgetLineControl::cursorRect() const
 {
-    QTextLine l = textLayout()->lineAt(0);
-    int c = m_cursor;
-    if (m_preeditCursor != -1)
-        c += m_preeditCursor;
-    int cix = qRound(l.cursorToX(c));
-    int w = m_cursorWidth;
-    int ch = l.height() + 1;
+    return rectForPos(m_cursor);
+}
 
-    return QRect(cix-5, 0, w+9, ch);
+/*!
+    \internal
+
+    Returns the bounds of the current anchor
+*/
+QRect QWidgetLineControl::anchorRect() const
+{
+    if (!hasSelectedText())
+        return cursorRect();
+    return rectForPos(m_selstart < m_selend ? m_selstart : m_selend);
 }
 
 /*!

src/widgets/widgets/qwidgetlinecontrol_p.h

@@ -212,7 +212,9 @@ public:
     void end(bool mark) { moveCursor(text().length(), mark); }
 
     int xToPos(int x, QTextLine::CursorPosition = QTextLine::CursorBetweenCharacters) const;
+    QRect rectForPos(int pos) const;
     QRect cursorRect() const;
+    QRect anchorRect() const;
 
     qreal cursorToX(int cursor) const { return m_textLayout.lineAt(0).cursorToX(cursor); }
     qreal cursorToX() const