Inserting a gliss does not increase note spacing sufficiently to show wavy line

The space between notes is not being increased sufficiently after inserting a gliss to allow a wavy-line gliss to be displayed.

Example: Gliss Test.mscz

Steps to reproduce

1. Creat a score
2. Enter two crotchets C above treble clef, F on top line of treble clef.
3. Select crotchets and double click wavy-line gliss. from pallet
4. Result small increase in space betwen notes. No gliss displayed.

The gliss is actually present, however, it can not be seen as there is insufficient space between the notes. Increasing the spacing between the notes in any way by adding stretch, or increasing the leading space or x-offset of the second note, or by adding an accidental or grace note to the second note. In the example score he first bar is what is shown after steps 1-3 above. The second bar is what is shown after increasing the X offset of the second note to 3.50. Thus the workaround is to increase the note spacing by manually shifting the second note.

The behaviour if the notes are shifted to different pitches is slightly modified when the first note is not on or below a ledger line but the second note is on or below a ledger line - e.g. first note on middle F, second note on the F below. In this case, the gliss can be seen. If both notes are on or below ledger lines the gliss can not be seen unless the spacing is manually increased.

See also: https://musescore.org/en/node/293383