set openglwindow event target to waveformviewer

src/widget/openglwindow.cpp

@@ -75,17 +75,20 @@ bool OpenGLWindow::event(QEvent* ev) {
         }
 
         if (t != QEvent::Resize && t != QEvent::Move && t != QEvent::Expose) {
-            // Send all events to the widget that owns the window container widget that contains
-            // this QOpenGLWindow.
-            // Except for:
+            // Send all events to the relevant widget. In the case of WSpinny and
+            // WVuMeter, that's m_pWidget itself (the widget that contains the window
+            // container widget that contains this QOpenGLWindow), in the case of
+            // waveforms, it will be the parent WWaveformViewer.
+            //
+            // All events except for:
             // - Resize and Move
-            //    Any change to the geometry comes from m_pWidget and its child m_pContainerWidget.
-            //    If we send the resulting events back to the m_pWidget we will quickly overflow
+            //    Any change to the geometry comes from the widget layouts.
+            //    If we send the resulting events back we will quickly overflow
             //    the event queue with repeated resize and move events.
             // - Expose
-            //    This event is only for windows
+            //    This event is only for windows.
 
-            QApplication::sendEvent(m_pWidget, ev);
+            QApplication::sendEvent(m_pWidget->windowEventTarget(), ev);
         }
     }
 

src/widget/wglwidgetqopengl.cpp

@@ -5,7 +5,7 @@
 #include "widget/wglwidget.h"
 
 WGLWidget::WGLWidget(QWidget* parent)
-        : QWidget(parent) {
+        : QWidget(parent), m_pWindowEventTarget(this) {
     // When the widget is resized or moved, the QOpenGLWindow visibly resizes
     // or moves before the widgets do. This can be solved by calling
     //   setAttribute(Qt::WA_PaintOnScreen);
@@ -25,6 +25,14 @@ QPaintDevice* WGLWidget::paintDevice() {
     return m_pOpenGLWindow;
 }
 
+void WGLWidget::setWindowEventTarget(QWidget* widget) {
+    m_pWindowEventTarget = widget;
+}
+
+QWidget* WGLWidget::windowEventTarget() const {
+    return m_pWindowEventTarget;
+}
+
 void WGLWidget::showEvent(QShowEvent* event) {
     if (!m_pOpenGLWindow) {
         m_pOpenGLWindow = new OpenGLWindow(this);

src/widget/wglwidgetqopengl.h

@@ -17,6 +17,7 @@ class WGLWidget : public QWidget {
   private:
     OpenGLWindow* m_pOpenGLWindow{};
     QWidget* m_pContainerWidget{};
+    QWidget* m_pWindowEventTarget{};
 
   public:
     WGLWidget(QWidget* parent);
@@ -32,6 +33,9 @@ class WGLWidget : public QWidget {
 
     void swapBuffers();
 
+    void setWindowEventTarget(QWidget* target);
+    QWidget* windowEventTarget() const;
+
     // called (indirectly) by WaveformWidgetFactory
     virtual void paintGL();
     // called by OpenGLWindow

src/widget/wwaveformviewer.cpp

@@ -274,6 +274,7 @@ void WWaveformViewer::setWaveformWidget(WaveformWidgetAbstract* waveformWidget)
         // OpenGLWindow will display it.
         if (m_waveformWidget->getGLWidget()) {
             m_waveformWidget->getGLWidget()->setToolTip(toolTip());
+            m_waveformWidget->getGLWidget()->setWindowEventTarget(this);
         }
 #endif
         // Make connection to show "Passthrough" label on the waveform, except for