Repeated segfault when merging and editing polygons

[qgib]

Author Name: Karl Kastner (Karl Kastner)
Original Redmine Issue: 15738
Affected QGIS version: 2.14.1
Redmine category:unknown

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Steps to reproduce:
Open the attached shape file that contains a set of polygons.
Select two polygons.
Merge the polygons.
Select the node tool.
Select a vertex.
Delete the vertex.
Keep selecting and deleting vertices until Qgis crashes.
Crashes on my machine at every attempt, but sometimes more, sometimes less vertices have to be deleted.
The merge step seems to be necessary to reproduce the bug.
The core dump is compressed 72MB and therefore not attached. I will provide the core dump on request.

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• test.tar.gz (Karl Kastner)

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• priority_id was changed from Normal to High

[qgib]

Author Name: Giovanni Manghi (@gioman)

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Just tested on the same platform on 2.18.4, no crashes. Please reopen if necessary.

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• resolution was changed from to not reproducable
• status_id was changed from Open to Closed

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• category_id was configured as Unknown