GtkGLArea: OpenGL ES Contexts don't work
When using gtk_gl_area_set_use_es to create an OpenGL ES Context, the GtkGLArea doesn't draw correctly. Tested with both gtk4 and gtk3.
Minimal reproducing example:
GTK3: main.c meson.build
GTK4: main.c meson.build
Window should look green, but only does when line 18 is commented out.