Drop Window::{windowShown,windowHidden}

They serve the same purpose as Window::hiddenChanged, so drop these
signals instead of having multiple signals to indicate the same thing.

src/effect/effectwindow.cpp

@@ -57,11 +57,7 @@ EffectWindow::EffectWindow(WindowItem *windowItem)
     d->m_x11Window = qobject_cast<KWin::X11Window *>(d->m_window) != nullptr;
 
     connect(d->m_window, &Window::hiddenChanged, this, [this]() {
-        if (d->m_window->isHidden()) {
-            Q_EMIT windowHidden(this);
-        } else {
-            Q_EMIT windowShown(this);
-        }
+        Q_EMIT windowHiddenChanged(this);
     });
     connect(d->m_window, &Window::maximizedChanged, this, [this]() {
         const MaximizeMode mode = d->m_window->maximizeMode();

src/effect/effectwindow.h

@@ -825,25 +825,9 @@ Q_SIGNALS:
     void windowDesktopsChanged(KWin::EffectWindow *window);
 
     /**
-     * The window @p w gets shown again. The window was previously
-     * initially shown with windowAdded and hidden with windowHidden.
-     *
-     * @see windowHidden
-     * @see windowAdded
+     * This signal is emitted when a window is hidden or shown.
      */
-    void windowShown(KWin::EffectWindow *w);
-
-    /**
-     * The window @p w got hidden but not yet closed.
-     * This can happen when a window is still being used and is supposed to be shown again
-     * with windowShown. On X11 an example is autohiding panels. On Wayland every
-     * window first goes through the window hidden state and might get shown again, or might
-     * get closed the normal way.
-     *
-     * @see windowShown
-     * @see windowClosed
-     */
-    void windowHidden(KWin::EffectWindow *w);
+    void windowHiddenChanged(KWin::EffectWindow *window);
 
 protected:
     friend EffectWindowVisibleRef;

src/plugins/slidingpopups/slidingpopups.cpp

@@ -207,8 +207,7 @@ void SlidingPopupsEffect::postPaintWindow(EffectWindow *w)
 void SlidingPopupsEffect::setupSlideData(EffectWindow *w)
 {
     connect(w, &EffectWindow::windowFrameGeometryChanged, this, &SlidingPopupsEffect::slotWindowFrameGeometryChanged);
-    connect(w, &EffectWindow::windowShown, this, &SlidingPopupsEffect::slideIn);
-    connect(w, &EffectWindow::windowHidden, this, &SlidingPopupsEffect::slideOut);
+    connect(w, &EffectWindow::windowHiddenChanged, this, &SlidingPopupsEffect::slotWindowHiddenChanged);
 
     // X11
     if (m_atom != XCB_ATOM_NONE) {
@@ -249,6 +248,15 @@ void SlidingPopupsEffect::slotWindowDeleted(EffectWindow *w)
     m_animationsData.remove(w);
 }
 
+void SlidingPopupsEffect::slotWindowHiddenChanged(EffectWindow *w)
+{
+    if (w->isHidden()) {
+        slideOut(w);
+    } else {
+        slideIn(w);
+    }
+}
+
 void SlidingPopupsEffect::slotPropertyNotify(EffectWindow *w, long atom)
 {
     if (!w || atom != m_atom || m_atom == XCB_ATOM_NONE) {

src/plugins/slidingpopups/slidingpopups.h

@@ -55,6 +55,7 @@ private Q_SLOTS:
     void slotPropertyNotify(EffectWindow *w, long atom);
     void slotWaylandSlideOnShowChanged(EffectWindow *w);
     void slotWindowFrameGeometryChanged(EffectWindow *w, const QRectF &);
+    void slotWindowHiddenChanged(EffectWindow *w);
 
     void slideIn(EffectWindow *w);
     void slideOut(EffectWindow *w);

src/window.cpp

@@ -72,9 +72,6 @@ Window::Window()
     connect(this, &Window::interactiveMoveResizeStarted, this, &Window::moveResizedChanged);
     connect(this, &Window::interactiveMoveResizeFinished, this, &Window::moveResizedChanged);
 
-    connect(this, &Window::windowShown, this, &Window::hiddenChanged);
-    connect(this, &Window::windowHidden, this, &Window::hiddenChanged);
-
     connect(this, &Window::paletteChanged, this, &Window::triggerDecorationRepaint);
 
     // If the user manually moved the window, don't restore it after the keyboard closes
@@ -4290,10 +4287,8 @@ void Window::setHidden(bool hidden)
     doSetHidden();
     if (hidden) {
         workspace()->activateNextWindow(this);
-        Q_EMIT windowHidden(this);
-    } else {
-        Q_EMIT windowShown(this);
     }
+    Q_EMIT hiddenChanged();
 }
 
 bool Window::isHiddenByShowDesktop() const

src/window.h

@@ -1332,8 +1332,6 @@ Q_SIGNALS:
     void damaged(KWin::Window *window);
     void inputTransformationChanged();
     void closed();
-    void windowShown(KWin::Window *window);
-    void windowHidden(KWin::Window *window);
     /**
      * Emitted whenever the Window's screen changes. This can happen either in consequence to
      * a screen being removed/added or if the Window's geometry changes.