Don't updateSizeAndPosition on setPos as it might change texture and that isn't threadsafe

sdlpp/sdlpp_textrenderer.cpp

@@ -85,6 +85,7 @@ void TextRenderer::updateTexture() {
 }
 void TextRenderer::updateSizeAndPosition() {
     RectangleRender::updateSizeAndPosition();
+    // TODO only if size actually changed
     updateTexture();
     updateDstRect();
 }