Graphics/show! does not refresh, need to manually dispose the window to show new content

I've noticed on current master than when I run `graphics/show!` repeatedly, the first graphics is shown. I need to close the window and run it to see the new one. Also, rendering `(w/TextStructure "The cat sat on the mat.")` will show on the first line > Show[The cat sat on the mat.", ImageSize -> {1623, 1362}] so it seems our code combination is not perfect.