On the Cocoa port, layouting a text containing the BOM result in an infinite loop

On the Cocoa port, layouting a text containing the BOM result in an infinite loop.

Here is the test case:

diff --git a/tests/auto/qtextlayout/tst_qtextlayout.cpp b/tests/auto/qtextlayout/tst_qtextlayout.cpp
index 5ccae94..8bdccd4 100644
— a/tests/auto/qtextlayout/tst_qtextlayout.cpp
+++ b/tests/auto/qtextlayout/tst_qtextlayout.cpp
@@ -118,7 +118,7 @@ private slots:
void smallTextLengthWordWrap();
void smallTextLengthWrapAtWordBoundaryOrAnywhere();
void testLineBreakingAllSpaces();
-
+ void lineWidthFromBOM();

private:
QFont testFont;
@@ -1033,6 +1033,16 @@ void tst_QTextLayout::testLineBreakingAllSpaces()
QCOMPARE(line2.naturalTextWidth(), 3. * TESTFONT_SIZE);
}

+void tst_QTextLayout::lineWidthFromBOM()
+

{ + const QString string(QChar(65279)); // BYTE ORDER MARK + QTextLayout layout(string); + layout.beginLayout(); + QTextLine line = layout.createLine(); + line.setLineWidth(INT_MAX/256); + layout.endLayout(); +}

+
void tst_QTextLayout::tabsForRtl()
{
QString word(QChar(0x5e9)); // a hebrew character