Visual bug: waveform after "undo"

[ndq0345934]

Shotcut-190615.glibc2.14-x86_64.AppImage
Linux 4.19.0-0.bpo.5-amd64 #1 SMP Debian 4.19.37-3~bpo9+1 (2019-05-18) x86_64 GNU/Linux

reproducible:
cntrl-v something mid clip.
cntrl-z undo.
waveform has moved from that insertion-point to the beginning of the clip.
rebuild waveform does not repair.

[shotcut]

This is fixed for the next version 19.07.