Silence some warnings

ui/formwidgets.cpp

@@ -503,6 +503,7 @@ void FormLineEdit::slotHandleTextChangedByUndoRedo( int pageNumber,
                                                     int cursorPos,
                                                     int anchorPos )
 {
+    Q_UNUSED(pageNumber);
     if ( textForm != m_form || contents == text() )
     {
         return;
@@ -596,6 +597,7 @@ void TextAreaEdit::slotHandleTextChangedByUndoRedo( int pageNumber,
                                                     int cursorPos,
                                                     int anchorPos )
 {
+    Q_UNUSED(pageNumber);
     if ( textForm != m_form )
     {
         return;
@@ -741,6 +743,7 @@ void FileEdit::slotHandleFileChangedByUndoRedo( int pageNumber,
                                                 int cursorPos,
                                                 int anchorPos )
 {
+    Q_UNUSED(pageNumber);
     if ( form != m_form || contents == text() )
     {
         return;

ui/pageview.cpp

@@ -5292,6 +5292,8 @@ void PageView::slotProcessRenditionAction( const Okular::RenditionAction *action
         case Okular::RenditionAction::Resume:
             vw->play();
             break;
+        default:
+            return;
     };
 }
 

ui/presentationwidget.cpp

@@ -2304,6 +2304,8 @@ void PresentationWidget::slotProcessRenditionAction( const Okular::RenditionActi
         case Okular::RenditionAction::Resume:
             vw->play();
             break;
+        default:
+            return;
     };
 }