[connectors] 'Exchange Position' of objects with orthogonal connectors causes crash

[su_v]

Inkscape 0.48+devel r9755 on Mac OS X 10.5.8

Using 'Exchange Position' with objects connected by orthogonal connectors causes Inkscape to crash and results in a broken emergency-save file.

Steps to reproduce:
1) draw some objects
2) connect them with orthogonal connector lines
3) select two or more objects
4) apply 'Exchange Positions' from the 'Align&Distribute' dialog
-> crash

Console message:
Assertion failed: (displayRoute.at(indexLow)[altDim] < displayRoute.at(indexHigh)[altDim]), function buildOrthogonalChannelInfo, file libavoid/orthogonal.cpp, line 1747.

Emergency-saved file cannot be open in Inkscape: it triggers the same crash again (file attached).

Related:
Bug #171944 “Exchange position of selected objects”:
<https://bugs.launchpad.net/inkscape/+bug/171944>

[su_v (suv-lp)]

Emergency-saved file, causes same crash when opened in Inkscape.

[jazzynico (jazzynico)]

Confirmed on Ubuntu 10.04, Inkscape trunk revision 9575.
It doesn't happen all the time, and I haven't found what triggers the crash.

Is there a point in taking connectors into account when aligning/rotating objects?
IMHO, they should be ignored.

[Michael Wybrow (mjwybrow)]

I've tried a few times, and I can't reproduce this at all. Any further thoughts on how to trigger this bug?

[su_v (suv-lp)]

Still present and reproduced in Inkscape 0.48+devel r9854 on OS X 10.5.8, steps as originally described (tested with r9854, default preferences and default template)

In the attached file select the red and green rectangle, open the 'Align&Distribute' dialog and click on the first of the three 'Exchange position' buttons in the 'Rearrange' section.

(crashes consistently using a local debug build -- r9854 compiled with CFLAGS="-g -O3 -Wall" -- but also e.g. with r9841 from modevia)

[su_v (suv-lp)]

Same console message and backtrace in Bug #700298 “File with connector crashes on load”.

[su_v (suv-lp)]

Same console message and backtrace in Bug #705382 “A file I created in inkscape caused it crash and crashes each time immediately after opening file.”

[lippj (j-lipp)]

I can also trigger this error on Win7, with Inkscape 0.48.0 r9645. attempting to open attached file causes error every time. Full error message given:
Microsoft visual C++ Runtime Library

Assertion failed!

Program: C:\Program Files (x86)\Inkscape.exe
File: src/libavoid/orthogonal.cpp
Line: 1747

Expression: displayRoute.at(indexLow)[altDim] < displayRoute.at(indexHigh)[altDim]

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts

(Press Retry to debug the application - JIT must be enabled)

[lippj (j-lipp)]

I have managed to rescue my file by text editing the .svg. I removed all <path... entries which referred to connectors which had been translated. Inkscape could then open it. I then had to manually add the connections back in (but this time I used the bezier/straight line tool rather than conmnectors). Hope this info helps pin it down a bit further.

[su_v (suv-lp)]

> I then had to manually add the connections back in

This should not necessary. As described in previously mentioned related bug #705382 comment #3, changing the value "orthogonal" of the path attribute 'inkscape:connector-type' to "polyline" allows to reopen the file without crash - with the connectors still in place (though no longer orthogonally routed).

[su_v (suv-lp)]

Same console message and backtrace in Bug #716057 in Inkscape: “Node tool causes inkscape crash”.

[su_v (suv-lp)]

Same console message and similar backtrace in Bug #771738 in Inkscape: “Connector tool crash Inkscape ” (trigger: coinciding begin and end nodes of a new orthogonal connector by double-clicking a highlighted connector point).

[David Menasce (zaprime)]

I have managed to trigger the error twice (and unfortunately don't know what I did so can't replicate it). Now I have to uncorrupt my file and emergency save file :(

"Microsoft visual C++ Runtime Library

Assertion failed!

Program: C:\Program Files (x86)\Inkscape.exe
 File: src/libavoid/orthogonal.cpp
 Line: 1747

Expression: displayRoute.at(indexLow)[altDim] < displayRoute.at(indexHigh)[altDim]

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts

(Press Retry to debug the application - JIT must be enabled)"

Clicking either button crashes Inkscape.

Interestingly enough, the files open fine in IE and Opera although the text is missing.

[su_v (suv-lp)]

Attaching fixed version of 'Systems Diagram V2.svg.2011_06_04_22_49_26.0.svg'
(opens in 0.48.1 and current trunk without crash)

[su_v (suv-lp)]

Crash no longer reproduced with patch attached to bug #771738
tested with Inkscape 0.48+devel r10268+patch on Mac OS X 10.5.8 (i386)