Merge: searching from the message pane (item 85)

Five surfaces in the message pane offer a search built from what they show:
the header's subject and date, its sender and recipients on a single-message
thread, a tag chip, a body selection, and every header per message in the
details dialog. Each offers Search for this, which replaces the query, and
Add to search, which narrows it.

The details dialog became labelled rows along the way, which the user wanted
independently of this feature.

Hand tested through every surface, including the case the parenthesising
exists for: adding a sender to 'tag:inbox or tag:flagged' narrows it rather
than widening it.

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/test_mimeparser.cpp b/tests/test_mimeparser.cpp
index bac71f6..af6307e 100644
--- a/tests/test_mimeparser.cpp
+++ b/tests/test_mimeparser.cpp
@@ -47,6 +47,7 @@ private slots:
     void recipientSummarySurvivesUnusableInput();
     void folderNameSurvivesATimezoneComment();
     void savingABatchNeverOverwrites();
+    void parsesADateWithATimezoneComment();
 
 private:
     QString fixture(const QString &name) const
@@ -485,5 +486,27 @@ void TestMimeParser::recipientSummarySurvivesUnusableInput()
     recipientSummary(QStringLiteral("\"unterminated <a@example.org>"));
 }
 
+void TestMimeParser::parsesADateWithATimezoneComment()
+{
+    // Qt::RFC2822Date rejects the WHOLE string when a trailing comment is
+    // present (verified on Qt 6.11), and "+0200 (CEST)" is both legal and
+    // common. Without the comment stripped, every such message loses its date
+    // silently: the attachment folder loses its prefix, and a date search
+    // offers nothing with no indication why.
+    const QDateTime withComment = MimeParser::parseDate(
+        QStringLiteral("Fri, 14 Aug 2026 09:30:00 +0200 (CEST)"));
+    QVERIFY(withComment.isValid());
+    QCOMPARE(withComment.date(), QDate(2026, 8, 14));
+
+    const QDateTime plain = MimeParser::parseDate(
+        QStringLiteral("Fri, 14 Aug 2026 09:30:00 +0200"));
+    QVERIFY(plain.isValid());
+    QCOMPARE(plain.date(), QDate(2026, 8, 14));
+
+    // Nothing usable is an invalid QDateTime, never a guess.
+    QVERIFY(!MimeParser::parseDate(QStringLiteral("last Tuesday")).isValid());
+    QVERIFY(!MimeParser::parseDate(QString()).isValid());
+}
+
 QTEST_MAIN(TestMimeParser)
 #include "test_mimeparser.moc"