Adjust right bearing when breaking with line separators

If we found a forced line break with line separator (e.g. '\n'),
take the right bearing of previous glyph into account, otherwise
the resulting text width will be slightly smaller than the one
without a line separator.

Task-number: QTBUG-17020
Reviewed-by: Eskil

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/auto/qtextlayout/tst_qtextlayout.cpp b/tests/auto/qtextlayout/tst_qtextlayout.cpp
index 0f1ff66259..2d1556631f 100644
--- a/tests/auto/qtextlayout/tst_qtextlayout.cpp
+++ b/tests/auto/qtextlayout/tst_qtextlayout.cpp
@@ -124,6 +124,7 @@ private slots:
     void lineWidthFromBOM();
     void textWidthVsWIdth();
     void textWidthWithStackedTextEngine();
+    void textWidthWithLineSeparator();
 
 private:
     QFont testFont;
@@ -1399,5 +1400,21 @@ void tst_QTextLayout::textWidthWithStackedTextEngine()
     QCOMPARE(line.naturalTextWidth(), fm.width(text));
 }
 
+void tst_QTextLayout::textWidthWithLineSeparator()
+{
+    QString s1("Save Project"), s2("Save Project\ntest");
+    s2.replace('\n', QChar::LineSeparator);
+
+    QTextLayout layout1(s1), layout2(s2);
+    layout1.beginLayout();
+    layout2.beginLayout();
+
+    QTextLine line1 = layout1.createLine();
+    QTextLine line2 = layout2.createLine();
+    line1.setLineWidth(0x1000);
+    line2.setLineWidth(0x1000);
+    QCOMPARE(line1.naturalTextWidth(), line2.naturalTextWidth());
+}
+
 QTEST_MAIN(tst_QTextLayout)
 #include "tst_qtextlayout.moc"