Send libRocket key events before mouse events

On Linux (at least), a key event is accompanied with a mouse position
event.  If a libRocket UI is listening to e.g. "mouseover" events,
then any keypress will first appear to be a mouse movement, tripping
up code that tries to handle focus with both keyboard and mouse
support.

This change merely dispatches key events before any mouse events to
avoid this problem.

panda/src/rocket/rocketInputHandler.cxx

@@ -302,30 +302,6 @@ void RocketInputHandler::
 update_context(Rocket::Core::Context *context, int xoffs, int yoffs) {
   MutexHolder holder(_lock);
 
-  if (_mouse_xy_changed) {
-    _mouse_xy_changed = false;
-
-    context->ProcessMouseMove(_mouse_xy.get_x() - xoffs,
-                              _mouse_xy.get_y() - yoffs, _modifiers);
-  }
-
-  if (_mouse_buttons.size() > 0) {
-    ButtonActivityMap::const_iterator it;
-    for (it = _mouse_buttons.begin(); it != _mouse_buttons.end(); ++it) {
-      if (it->second) {
-        context->ProcessMouseButtonDown(it->first, _modifiers);
-      } else {
-        context->ProcessMouseButtonUp(it->first, _modifiers);
-      }
-    }
-    _mouse_buttons.clear();
-  }
-
-  if (_wheel_delta != 0) {
-    context->ProcessMouseWheel(_wheel_delta, _modifiers);
-    _wheel_delta = 0;
-  }
-
   if (_keys.size() > 0) {
     ButtonActivityMap::const_iterator it;
     for (it = _keys.begin(); it != _keys.end(); ++it) {
@@ -356,5 +332,29 @@ update_context(Rocket::Core::Context *context, int xoffs, int yoffs) {
     _text_input.clear();
   }
 
+  if (_mouse_xy_changed) {
+    _mouse_xy_changed = false;
+
+    context->ProcessMouseMove(_mouse_xy.get_x() - xoffs,
+                              _mouse_xy.get_y() - yoffs, _modifiers);
+  }
+
+  if (_mouse_buttons.size() > 0) {
+    ButtonActivityMap::const_iterator it;
+    for (it = _mouse_buttons.begin(); it != _mouse_buttons.end(); ++it) {
+      if (it->second) {
+        context->ProcessMouseButtonDown(it->first, _modifiers);
+      } else {
+        context->ProcessMouseButtonUp(it->first, _modifiers);
+      }
+    }
+    _mouse_buttons.clear();
+  }
+
+  if (_wheel_delta != 0) {
+    context->ProcessMouseWheel(_wheel_delta, _modifiers);
+    _wheel_delta = 0;
+  }
+
   context->Update();
 }