LPE perspective path crashes Inkscape

[Kris]

Wathever the path is drawn, when selecting the perspective path LPE for applying on the path, Inkscape crashes.
No detailed debug information or console messages available.

Vista 64 bit, r11813.

[su_v (suv-lp)]

Duplicate of bug #280431 “System freezes on Perspective Path Effect“?

[su_v (suv-lp)]

Note that this path effect is not enable with default builds (it's among the experimental LPEs which are disabled because they are not stable).

[su_v (suv-lp)]

Attaching backtrace with Inkscape 0.48+devel r11809 on OS X 10.7.4

[su_v (suv-lp)]

Unsetting bug importance (I'm not sure whether importance should be high for effects which are intentionally disabled with default builds).

[su_v (suv-lp)]

> Note that this path effect is not enable with default builds (it's among the
> experimental LPEs which are disabled because they are not stable).

Seems that in trunk, the experimental LPEs are currently enabled by default for Windows builds (unlike on linux/osx):
<http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/11203>

[Alvin Penner (apenner)]

yes, on Windows, these appear to be enabled by default, backtrace attached

[Johan Engelen (johanengelen)]

I've just now disabled experimental LPEs in trunk because we are in frost now.

[su_v (suv-lp)]

Bug #280431 “System freezes on Perspective Path Effect“ has been marked as duplicate of this one (which has more recent backtraces attached).

[su_v (suv-lp)]

jabiertxof on irc noted that the crash occurs if no perspective object is defined in the current document (created by the 3dbox tool) - confirmed with 0.48+devel r12670 (with experimental LPE enabled).

[Jabiertxof (jabiertxof)]

I attach a diff who make some improvements to the LPE:
1. Alert if no perspective element in defs
2. Add a button to refresh the perspective if changed by editing his 3dBOX
3. Add a text box to input the ID of the perspective to use, default first perspective

[ScislaC (scislac)]

The patch mitigates the problem by A) not crashing and B) getting the user's attention as to why it won't work yet.

[Jabiertxof (jabiertxof)]

Here the patch ready to apply to current trunk.
Changed gtkmm sub-headers to main and also improve the perspective id widget.

I need better "Grammar" for this strings:
You need a BOX 3D object
First perspective selected
First perspective
Set the perspective ID to apply
Refresh perspective