Add Window::captionNormalChanged()

This signal notifies when the client specified caption changes, not when
kwin changes it because it changed the suffix, etc.

src/internalwindow.cpp

@@ -476,6 +476,7 @@ void InternalWindow::setCaption(const QString &caption)
     const QString oldCaptionSuffix = m_captionSuffix;
     updateCaption();
 
+    Q_EMIT captionNormalChanged();
     if (m_captionSuffix == oldCaptionSuffix) {
         Q_EMIT captionChanged();
     }

src/waylandwindow.cpp

@@ -204,9 +204,15 @@ void WaylandWindow::updateCaption()
 
 void WaylandWindow::setCaption(const QString &caption)
 {
+    const QString oldNormal = m_captionNormal;
     const QString oldSuffix = m_captionSuffix;
+
     m_captionNormal = caption.simplified();
     updateCaption();
+
+    if (m_captionNormal != oldNormal) {
+        Q_EMIT captionNormalChanged();
+    }
     if (m_captionSuffix == oldSuffix) {
         // Don't emit caption change twice it already got emitted by the changing suffix.
         Q_EMIT captionChanged();

src/window.h

@@ -1410,6 +1410,7 @@ Q_SIGNALS:
     void paletteChanged(const QPalette &p);
     void colorSchemeChanged();
     void captionChanged();
+    void captionNormalChanged();
     void maximizedAboutToChange(MaximizeMode mode);
     void maximizedChanged();
     void transientChanged();

src/x11window.cpp

@@ -2329,10 +2329,6 @@ void X11Window::setCaption(const QString &_s, bool force)
         return;
     }
     cap_normal = s;
-    if (!force && !changed) {
-        Q_EMIT captionChanged();
-        return;
-    }
 
     bool reset_name = force;
     bool was_suffix = (!cap_suffix.isEmpty());
@@ -2363,6 +2359,9 @@ void X11Window::setCaption(const QString &_s, bool force)
         info->setVisibleIconName(QString(cap_iconic + cap_suffix).toUtf8().constData());
     }
 
+    if (changed) {
+        Q_EMIT captionNormalChanged();
+    }
     Q_EMIT captionChanged();
 }