Always emit Client::captionChanged when the caption changed

Summary:
With ddf3536f19 a regression got
introduced resulting in Client::captionChanged not being emitted if
Client::setCaption was called without the force parameter.

The regression is only in master branch.

BUG: 383444

Test Plan: Added test case passes

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D7290

autotests/integration/x11_client_test.cpp

@@ -414,7 +414,6 @@ void X11ClientTest::testCaptionChanges()
     QVERIFY(captionChangedSpy.isValid());
     info.setName("bar");
     xcb_flush(c.data());
-    QEXPECT_FAIL("", "BUG 383444", Continue);
     QVERIFY(captionChangedSpy.wait());
     QCOMPARE(client->caption(), QStringLiteral("bar"));
 

client.cpp

@@ -1431,8 +1431,10 @@ void Client::setCaption(const QString& _s, bool force)
         if (!s[i].isPrint())
             s[i] = QChar(u' ');
     cap_normal = s;
-    if (!force)
+    if (!force) {
+        emit captionChanged();
         return;
+    }
 
     bool reset_name = force;
     bool was_suffix = (!cap_suffix.isEmpty());