Bug#926500: freecad: FreeCad crashes when attemting to edit a existing sketch

[Pere Nubiola Radigales]

Package: freecad
Version: 0.18+dfsg1-1
Severity: grave
Justification: renders package unusable

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

crete a new file
create a ssketch ZY
creates a vertical slot with radius 76 and the straight arm with a length of 76
Create 3 circles, the first one with a radius of 66 and the others with an equivalent restriction
Create 3 circles, the first one with a radius of 66 and the others with an equivalent restriction
The 3 circles will have a vertical distance between centers of 99 and a horizontal distance of 0.
The distance between the top center of the slot and the center of the lower circumference will be 99 in vertical and 25 in horizontal.
We create another slot with the curves and the straight lines with the same restriction as the first one.
We create a restriction that leaves the lower center of the two slots with a vertical distance of 0.
We create a constraint that separates the outer points of the two slots with a distance of 90.
The sketcher is closed, and it is opened again.
The crash has been triggered.

the shell command ps -ef | grep -i Freec returns:
perico   12407 12145  0 07:23 pts/2    00:00:00 sh -c /usr/bin/sensible-editor  '/tmp/reportbug-freecad-20190406-12145-4oyoidcy'
perico   12408 12407  0 07:23 pts/2    00:00:00 /bin/sh /usr/bin/sensible-editor /tmp/reportbug-freecad-20190406-12145-4oyoidcy
perico   12416 12408  0 07:23 pts/2    00:00:00 /bin/nano /tmp/reportbug-freecad-20190406-12145-4oyoidcy

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-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-4-amd64 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=ca_ES.UTF-8, LC_CTYPE=ca_ES.UTF-8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages freecad depends on:
ii  freecad-python3  0.18+dfsg1-1

Versions of packages freecad recommends:
ii  calculix-ccx  2.11-1+b3
ii  graphviz      2.40.1-5+b2

Versions of packages freecad suggests:
pn  freecad-doc     <none>
ii  povray          1:3.7.0.8-1
pn  python-collada  <none>

-- no debconf information