[regression] Frame not tall enough if line-spacing > 0

[aaronjensen]

For some reason, #48 is back for me in Emacs 30, but only when :height is set:

(setq-default line-spacing 0.1)
(posframe-show " *my-posframe-buffer*"
                 :string "This is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test\nThis is a test"
                 :height 7
                 :position (point))