You could comment out the ifdefs [here](https://github.com/geany/geany/blob/5cdfe35cf26ca6935eddc652cceb799e0cbad142...) so it happens on all platforms and GTK versions to see if it fixes it.
Do you mean like this? ``` /*#ifdef GDK_WINDOWING_QUARTZ*/ /*# if ! GTK_CHECK_VERSION(3,16,0)*/ /* "retina" (HiDPI) display support on OS X - requires disabling buffered draw * on older GTK versions */ /*SSM(sci, SCI_SETBUFFEREDDRAW, 0, 0);*/ /*# endif*/ /*#endif*/ ``` And what are the disadvantages when it is turned off?