QTextLayout: fix maximumWidth() for a text containing line separator

This is improved version of previous fix
013c346a8dcbd618febb07884c64c740daf9754d that was reverted because it
broke some tests for Quick Text. The problem was that it did not work
correctly in the case the text was wrapped to a fixed width.
To deal with this we'll accumulate current line full width (as if it
hadn't been wrapped) in layout data (layoutData->currentMaxWidth).
Then when the next line is explicitly wrapped by line or paragraph
separator, this accumulated width will be used to adjust layout's
maximum width.

Change-Id: Iad7119d9808e1db15fe1fbc5db049c3db928529f
Fixes: QTBUG-89557
Fixes: QTBUG-104986
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 15 insertions, 1 deletions

diff --git a/tests/auto/gui/text/qtextlayout/tst_qtextlayout.cpp b/tests/auto/gui/text/qtextlayout/tst_qtextlayout.cpp
index 67d4b9884b..3958e2a01c 100644
--- a/tests/auto/gui/text/qtextlayout/tst_qtextlayout.cpp
+++ b/tests/auto/gui/text/qtextlayout/tst_qtextlayout.cpp
@@ -2655,17 +2655,28 @@ void tst_QTextLayout::min_maximumWidth_data()
     QTest::newRow("long string") << QStringLiteral("lmong_long_crazy_87235982735_23857239682376923876923876-fuwhfhfw-names-AAAA-deeaois2019-03-03.and.more");
     QTest::newRow("QTBUG-106947") << QStringLiteral("text                                text");
     QTest::newRow("spaces") << QStringLiteral("                text                text                ");
+    QTest::newRow("QTBUG-104986") << QStringLiteral("text\ntext\ntext");
+    QTest::newRow("spaces + line breaks") << QStringLiteral("       \n         text\n                \ntext       \n         ");
 }
 
 void tst_QTextLayout::min_maximumWidth()
 {
     QFETCH(QString, text);
+    text.replace('\n', QChar::LineSeparator);
 
     QTextLayout layout(text, testFont);
     layout.setCacheEnabled(true);
 
+    QTextOption opt;
+    opt.setWrapMode(QTextOption::NoWrap);
+    layout.setTextOption(opt);
+    layout.beginLayout();
+    while (layout.createLine().isValid()) { }
+    layout.endLayout();
+
+    const qreal nonWrappedMaxWidth = layout.maximumWidth();
+
     for (int wrapMode = QTextOption::NoWrap; wrapMode <= QTextOption::WrapAtWordBoundaryOrAnywhere; ++wrapMode) {
-        QTextOption opt;
         opt.setWrapMode((QTextOption::WrapMode)wrapMode);
         layout.setTextOption(opt);
         layout.beginLayout();
@@ -2674,6 +2685,9 @@ void tst_QTextLayout::min_maximumWidth()
         const qreal minWidth = layout.minimumWidth();
         const qreal maxWidth = layout.maximumWidth();
 
+        QCOMPARE_LE(minWidth, maxWidth);
+        QCOMPARE_LE(maxWidth, nonWrappedMaxWidth); // maxWidth for wrapped text shouldn't exceed maxWidth for the text without wrapping.
+
         // Try the layout from slightly wider than the widest (maxWidth)
         // and narrow it down to slighly narrower than minWidth
         // layout.maximumWidth() should return the same regardless