Midpoints of upper & lower sides of I/O symbol of flowchart should be vertically aligned
Currently these 2 midpoints (the red points in the picture below) are not vertically aligned, which makes it impossible for lines and symbols above and below to be vertically aligned, and looks very strange.
I guess it's better to move the midpoints to where the middle green points in the picture below locate, or make it possible for lines to stick to green points too.