Make search work on documents that describe Å as A + ◌̊

BUGS: 430243

autotests/searchtest.cpp

@@ -44,6 +44,7 @@ private slots:
     void test311232();
     void test323262();
     void test323263();
+    void test430243();
     void testDottedI();
     void testHyphenAtEndOfLineWithoutYOverlap();
     void testHyphenWithYOverlap();
@@ -222,6 +223,28 @@ void SearchTest::test323263()
     delete page;
 }
 
+void SearchTest::test430243()
+{
+    // 778 is COMBINING RING ABOVE
+    // 197 is LATIN CAPITAL LETTER A WITH RING ABOVE
+    QVector<QString> text;
+    text << QStringLiteral("A") << QString(QChar(778));
+
+    QVector<Okular::NormalizedRect> rect;
+    rect << Okular::NormalizedRect(0, 0, 1, 1) << Okular::NormalizedRect(1, 0, 2, 1);
+
+    CREATE_PAGE;
+
+    Okular::RegularAreaRect *result = tp->findText(0, QString(QChar(197)), Okular::FromTop, Qt::CaseSensitive, nullptr);
+    QVERIFY(result);
+    Okular::RegularAreaRect expected;
+    expected.append(rect[0] | rect[1]);
+    QCOMPARE(*result, expected);
+    delete result;
+
+    delete page;
+}
+
 void SearchTest::testDottedI()
 {
     // Earlier versions of okular had the bug that the letter "İ" (capital dotter i) did not match itself

core/textpage.cpp

@@ -245,8 +245,23 @@ TextPage::~TextPage()
 
 void TextPage::append(const QString &text, NormalizedRect *area)
 {
-    if (!text.isEmpty())
+    if (!text.isEmpty()) {
+        if (!d->m_words.isEmpty()) {
+            TinyTextEntity *lastEntity = d->m_words.last();
+            const QString concatText = lastEntity->text() + text.normalized(QString::NormalizationForm_KC);
+            if (concatText != concatText.normalized(QString::NormalizationForm_KC)) {
+                // If this happens it means that the new text + old one have combined, for example A and ◌̊  form Å
+                NormalizedRect newArea = *area | lastEntity->area;
+                delete area;
+                delete lastEntity;
+                d->m_words.removeLast();
+                d->m_words.append(new TinyTextEntity(concatText.normalized(QString::NormalizationForm_KC), newArea));
+                return;
+            }
+        }
+
         d->m_words.append(new TinyTextEntity(text.normalized(QString::NormalizationForm_KC), *area));
+    }
     delete area;
 }