On-canvas Interface does not update when adding Powerstroke effect

[Kelvin Song]

In EditNodes mode, if you add a powerstroke effect, the canvas display will update, but the interface elements do not—i.e. the purple diamonds don't appear. You have to exit Edit mode and reenter it to see the purple diamonds. I'm on Ubuntu using the Inkscape 0.48+devel r.

[su_v (suv-lp)]

Reproduced with r12669 on OS X 10.7.5.

Also affects shape tools: adding powerstroke via path effect editor to an shape while the shape tool is active doesn't add the powerstroke handles either. Deselecting the shape (click on empty canvas) and selecting it again (without switching tools) triggers the powerstroke handles to be displayed.

[Tavmjong Bah (tavmjong-free)]

Possibly related: shape handles are missing after adding an LPE. To get the back, hide the LPE (click on the "eye" icon in the Path Effects dialog) and then switch tools.

[Liam P. White (liampwhite)]

Done.

[su_v (suv-lp)]

Patch fails to compile (glib2 2.38.2, glibmm 2.38.1, gtkmm 2.24.4):

In file included from ../../src/sp-lpe-item.cpp:42:
In file included from ../../src/ui/tool/multi-path-manipulator.h:16:
In file included from ../../src/ui/tool/node.h:32:
In file included from ../../src/ui/tool/selectable-control-point.h:12:
In file included from ../../src/ui/tool/control-point.h:13:
In file included from /Volumes/magenta/mp-trunk/quartz/include/gdkmm-2.4/gdkmm/pixbuf.h:9:
In file included from /Volumes/magenta/mp-trunk/quartz/include/glibmm-2.4/glibmm.h:89:
/Volumes/magenta/mp-trunk/quartz/include/glibmm-2.4/glibmm/threads.h:201:11: error: field has incomplete type 'GThread' (aka '_GThread')
  GThread gobject_;
          ^
/Volumes/magenta/mp-trunk/quartz/include/glib-2.0/glib/gthread.h:50:16: note: forward declaration of '_GThread'
typedef struct _GThread GThread;
               ^
1 error generated.
make[3]: *** [sp-lpe-item.o] Error 1

[su_v (suv-lp)]

Attached version of the patch does compile (thx @Liam for the help on irc).

[ScislaC (scislac)]

Fix committed in r13306. Thanks Liam!