In current lp:inkscape (trunk) and lp:inkscape/0.92.x, every time a selection handle (to resize, rotate or skew a selection) is grabbed and dragged, there is a critical warning on the console:
** (inkscape:52580): CRITICAL **: void Inkscape::SelTrans::grab(const Geom::Point &, gdouble, gdouble, bool, bool): assertion '!_grabbed' failed
Steps to reproduce:
1) launch inkscape trunk or 0.92.x
2) draw a rectangle
3) drag one of the selection handles
(e.g. to stretch or rotate the rectangle)
Based on tests with archived 0.92.x builds (on OS X 10.7.5):
- not reproduced with rev <= 15237,
- reproduced with rev >= 15238;
these warnings seem to have been exposed with the backport of r15293 from trunk in r15238:
https://bazaar.launchpad.net/~inkscape.dev/inkscape/0.92.x/changes/15238
Revision 15293: Add triangle knot.
https://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/15293
Reproduced with lp:inkscape r15369 on Ubuntu 14.04 and lp:inkscape/0.92.x r15284 on OS X 10.7.5.
confirmed on Windows 10, Inkscape 0.92pre4 15278 (32 bit exe)