Revert behavior of QTextLayout::boundingRect() when line width is set

In change 817469519a784b1cc84f89cb3cb84f7560874f8e, there was a
behavioral change which can cause regressions, as the bounding rect of
the QTextLayout would previously return the set line width when this
was greater than the calculated natural text width. We revert to this
behavior to avoid regressions and add an autotest for it. When the
line width is not set (and si.width is equal to QFIXED_MAX), then we
will still return the natural text width.

Reviewed-by: Lars

2 files changed, 15 insertions, 1 deletions

diff --git a/src/gui/text/qtextlayout.cpp b/src/gui/text/qtextlayout.cpp
index a1a17af..3f67408 100644
--- a/src/gui/text/qtextlayout.cpp
+++ b/src/gui/text/qtextlayout.cpp
@@ -858,7 +858,8 @@ QRectF QTextLayout::boundingRect() const
         const QScriptLine &si = d->lines[i];
         xmin = qMin(xmin, si.x);
         ymin = qMin(ymin, si.y);
-        xmax = qMax(xmax, si.x+si.textWidth);
+        QFixed lineWidth = si.width < QFIXED_MAX ? qMax(si.width, si.textWidth) : si.textWidth;
+        xmax = qMax(xmax, si.x+lineWidth);
         // ### shouldn't the ascent be used in ymin???
         ymax = qMax(ymax, si.y+si.height());
     }
diff --git a/tests/auto/qtextlayout/tst_qtextlayout.cpp b/tests/auto/qtextlayout/tst_qtextlayout.cpp
index b67dc30..1a5f493 100644
--- a/tests/auto/qtextlayout/tst_qtextlayout.cpp
+++ b/tests/auto/qtextlayout/tst_qtextlayout.cpp
@@ -111,6 +111,7 @@ private slots:
     void widthOfTabs();
     void columnWrapWithTabs();
     void boundingRectForUnsetLineWidth();
+    void boundingRectForSetLineWidth();
 
     // QTextLine stuff
     void setNumColumnsWrapAtWordBoundaryOrAnywhere();
@@ -1319,6 +1320,18 @@ void tst_QTextLayout::boundingRectForUnsetLineWidth()
     QCOMPARE(layout.boundingRect().width(), line.naturalTextWidth());
 }
 
+void tst_QTextLayout::boundingRectForSetLineWidth()
+{
+    QTextLayout layout("FOOBAR");
+
+    layout.beginLayout();
+    QTextLine line = layout.createLine();
+    line.setLineWidth(QFIXED_MAX - 1);
+    layout.endLayout();
+
+    QCOMPARE(layout.boundingRect().width(), qreal(QFIXED_MAX - 1));
+}
+
 void tst_QTextLayout::lineWidthFromBOM()
 {
     const QString string(QChar(0xfeff)); // BYTE ORDER MARK