Three push buttons are
placed horizontally in a row. Push button 1 is bidirectionally attached
on its right side to the left side of push button 2. Push button 2
is bidirectionally attached on its right side to the left side of
push button 3. Additionally, there are two pixels between each push
button.
If you select push button
1 and push button 2 and move them to the left by two pixels, push
button 3 will not grow to the left by two pixels to keep an appropriate
distance between itself and the selected push buttons. Instead, push
button 1 and 2 are moved to the left and the distance between them
is recalculated. Push button 3 now has four pixels between itself
and push button 2 instead of two pixels. Now, when either push button
2 or push button 3 is moved by itself, the attachment maintains a
four-pixel distance instead of a two-pixel distance.