Comment # 2 on bug 105436 from almos

f314a532fdc7af8381586144d2631d9968331f05 is the first bad commit
commit f314a532fdc7af8381586144d2631d9968331f05
Author: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Date:   Wed Jun 21 11:31:43 2017 +0200

    mesa: do not trigger _NEW_TEXTURE_STATE in glActiveTexture()

    This looks like useless because gl_context::Texture::CurrentUnit
    is not used by _mesa_update_texture_state() and friends.

    Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
    Reviewed-by: Brian Paul <brianp@vmware.com>

:040000 040000 c2a46b6dcce50edf810147e07de977f38d33533a
606c977b6357381074d205daf2815ebb93da1029 M      src

Adding back the FLUSH_VERTICES fixes the issue.