trunk: crash when converting a clone or a group with a clone to path

[su_v]

With current trunk, Inkscape crashes when converting a group which contains a clone to path. The same steps do not trigger a crash with lp:inkscape/0.92.x.

Steps to reproduce:
1) launch trunk
2) draw a rect
3) clone the rect (Alt+D)
4) move clone away from original
5) group the clone (Ctrl+G)
6) apply object to path (Shift+Ctrl+C)

Alternative steps:
1) launch trunk
2) draw rect
3) clone the rect (Alt+D)
4) apply object to path to selected clone (Shift+Ctrl+C)

--> crash:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7573d46 in SPLPEItem::removeAllPathEffects(bool) () from /home/su-v/local/src/inkscape/build/lib/libinkscape_base.so

Reproduced with Inkscape 0.92+devel r15470, r15500 on Ubuntu 14.04.5 LTS.

[Alvin Penner (apenner)]

reproduced on Windows 10, Inkscape 0.92+devel 15500

[Alvin Penner (apenner)]

it looks like 0.92.x is avoiding the problem entirely by refusing to perform the operation.
The status bar says "No objects to convert" when converting the group to path

[jazzynico (jazzynico)]

Reproduced on Xubuntu 16.04, lp:inkscape rev. 15505.

[Jabiertxof (jabiertxof)]

This patch fix the bug.

[su_v (suv-lp)]

Patch tested successfully on Ubuntu 14.04.5 LTS with lp:inkscape r15512 - no more crashes when applying 'Object to path' to a selection which includes clone(s). The clone(s) (as expected, and as with earlier versions) are skipped from the operation.

The comment in the added code likely needs clarification (currently it is just copy&pasted from 3dbox section).

[su_v (suv-lp)]

Closing - the issue is now tracked in more recent bug #1719505, and was fixed with recent commit
 https://gitlab.com/inkscape/inkscape/commit/0f5574afd93303c82c1ae34fd1c59791c4d81217

See my comments in bug #1719505 for reasons why this report is closed as Invalid now instead of being linked as duplicate.

[su_v (suv-lp)]

@bug-team - please remove the milestone from this report, thanks.