Add hairpin (and dynamics) to elements that trigger space increase to avoid collision in certain cases
When adding dynamics requiring much space such as pp and ppp to notes which are very close to each other, as the dynamics are by default centered relative to notes, they tend to overlap.
Adding a hairpin between the notes bearing the dynamics is even worse, since the hairpin badly overlaps with both dynamics (See attached example). This doesn't seem to be the spirit of autoplacement, and many times it cannot be easily worked around by disabling autoplacement and manually moving the dynamics because there may be just not enough room to do so.
The only easy workaround is to stretch the measure by a large factor until the overlapp is cleared (see example), but this affects proportionally all parts of the measure, such as rests, creating unnecessary waste of space.
The proposed solution is to include both dynamics and hairpins in the list of elements that trigger an increase of horizontal space between notes, such as when adding new notes in between (e.g., replacing a quarter note by 4 sixteenth notes) or lyrics with long sylables.