What replaces gdk_bitmap_create_from_data() ?

[Murray Cumming <murrayc murrayc com>]

I'm trying to fix the gtkmm 3 build against gtk+ 3 from git master.

gdk_bitmap_create_from_data() has been removed but it's not yet
deprecated in the gtk-2-22 branch, so I can't read about what replaces
it. I see no other simple way to create a GdkBitmap.

Is GdkBitmap meant to be removed completely? There are still functions
in git master that take it as a parameter.

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