hide empty annotations

Only displays annotations when they're not an empty node (struct only) with empty children. Needs to look at children recursively, as deleting foo.bar.baz would keep foo and foo.bar alive.

qrenderdoc/Widgets/AnnotationDisplay.cpp

@@ -96,14 +96,32 @@ void AnnotationDisplay::OnSelectedEventChanged(uint32_t eventId)
   setAnnotationObject(ev.annotations);
 }
 
+bool AnnotationDisplay::shouldBeDisplayed(const SDObject &obj)
+{
+  if(obj.type.flags & SDTypeFlags::Hidden)
+    return false;
+
+  if(obj.name.beginsWith("__"))
+    return false;
+
+  if(obj.type.basetype == SDBasic::Struct)
+  {
+    for(const SDObject *child_obj : obj)
+    {
+      if(shouldBeDisplayed(*child_obj))
+        return true;
+    }
+    return false;
+  }
+
+  return true;
+}
+
 void AnnotationDisplay::addStructuredChildren(RDTreeWidgetItem *parent, const SDObject &parentObj)
 {
   for(const SDObject *obj : parentObj)
   {
-    if(obj->type.flags & SDTypeFlags::Hidden)
-      continue;
-
-    if(obj->name.beginsWith("__"))
+    if(!shouldBeDisplayed(*obj))
       continue;
 
     QVariant name;