Add an extra minimum size hint, since Qt behaviour is broken by design

* The Qt behaviour is that if you call setMinimumSize on a widget, then
  the minimumSizeHint is IGNORED. So it is impossible to say "use this
  minimum size, unless the widget wants a higher minimum size".
* So instead we do this ourselves in RDLabel. Sigh.

qrenderdoc/Widgets/Extended/RDLabel.cpp

@@ -57,6 +57,8 @@ QSize RDLabel::minimumSizeHint() const
 {
   QSize sz = QLabel::minimumSizeHint();
   modifySizeHint(sz);
+  if(m_minSizeHint.isValid())
+    sz = sz.expandedTo(m_minSizeHint);
   return sz;
 }
 
@@ -87,6 +89,12 @@ QString RDLabel::text() const
   return QLabel::text();
 }
 
+void RDLabel::setMinimumSizeHint(const QSize &sz)
+{
+  m_minSizeHint = sz;
+  updateGeometry();
+}
+
 void RDLabel::mousePressEvent(QMouseEvent *event)
 {
   emit(clicked(event));

qrenderdoc/Widgets/Extended/RDLabel.h

@@ -39,6 +39,7 @@ public:
   void setText(const QString &text);
   QString text() const;
 
+  void setMinimumSizeHint(const QSize &sz);
   void setPreserveAspectRatio(bool preserve) { m_preserveRatio = preserve; }
   bool preserveAspectRatio() { return m_preserveRatio; }
 signals:
@@ -65,5 +66,7 @@ protected:
   bool m_preserveRatio = false;
   bool m_hover = false;
 
+  QSize m_minSizeHint;
+
   QVariant m_variant;
 };