allow current widget to dictate size of stacked widget for metatile/collision and events pages

forms/mainwindow.ui

@@ -677,7 +677,7 @@
                 </item>
                </layout>
               </widget>
-              <widget class="QStackedWidget" name="stackedWidget_MapEvents">
+              <widget class="AdjustingStackedWidget" name="stackedWidget_MapEvents">
                <property name="sizePolicy">
                 <sizepolicy hsizetype="Preferred" vsizetype="MinimumExpanding">
                  <horstretch>0</horstretch>
@@ -3036,6 +3036,11 @@
    <extends>QComboBox</extends>
    <header>noscrollcombobox.h</header>
   </customwidget>
+  <customwidget>
+   <class>AdjustingStackedWidget</class>
+   <extends>QStackedWidget</extends>
+   <header>adjustingstackedwidget.h</header>
+  </customwidget>
   <customwidget>
    <class>GraphicsView</class>
    <extends>QGraphicsView</extends>

include/ui/adjustingstackedwidget.h

@@ -0,0 +1,25 @@
+#ifndef ADJUSTINGSTACKEDWIDGET_H
+#define ADJUSTINGSTACKEDWIDGET_H
+
+#include <QStackedWidget>
+
+
+
+class AdjustingStackedWidget : public QStackedWidget
+{
+    Q_OBJECT
+
+public:
+    AdjustingStackedWidget(QWidget *parent = nullptr) : QStackedWidget(parent) {}
+
+    // override this to allow the stacked widget's current page to dictate size
+    virtual void setCurrentIndex(int index) {
+        QStackedWidget::setCurrentIndex(index);
+        for (int i = 0; i < this->count(); ++i) {
+            this->widget(i)->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
+        }
+        this->widget(index)->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);        
+    }
+};
+
+#endif // ADJUSTINGSTACKEDWIDGET_H

porymap.pro

@@ -119,6 +119,7 @@ HEADERS  += include/core/block.h \
     include/ui/noscrollcombobox.h \
     include/ui/noscrollspinbox.h \
     include/ui/montabwidget.h \
+    include/ui/adjustingstackedwidget.h \
     include/ui/paletteeditor.h \
     include/ui/selectablepixmapitem.h \
     include/ui/tileseteditor.h \

src/mainwindow.cpp

@@ -8,6 +8,7 @@
 #include "ui_eventpropertiesframe.h"
 #include "bordermetatilespixmapitem.h"
 #include "currentselectedmetatilespixmapitem.h"
+#include "adjustingstackedwidget.h"
 
 #include <QFileDialog>
 #include <QDirIterator>