Migrated from: https://bugs.launchpad.net/inkscape/+bug/168943 Filter effects applied to a horizontal or vertical line don't produce visible output. ===== Original description: On ubuntu, the latest autopackage version (inkscape200709061136 - haven't tested other packages or versions, or operating systems) crashes when a straight path with all the nodes aligned vertically or horizontally is blurred. The crash will not occur if the path has a curve, or all the nodes are not aligned vertically or horizontally. The crash occurs whether the line is drawn with the nodes aligned and then blurred, or if a line with nodes not aligned vertically or horizontally is blurred, and then the nodes aligned. To cause this crash: 1. Using the bezier tool, draw a straight line constrained vertically or horizontally 2. Blur the line (I did this with the fill and stroke dialog. Maybe manually blurring would not cause the crash?) gdb output: ``` glibmm-ERROR **: unhandled exception (type std::exception) in signal handler: what: Is nothing aborting... Program received signal SIGABRT, Aborted. [Switching to Thread -1225590560 (LWP 19970)] 0xffffe410 in __kernel_vsyscall () (gdb) bt #0 0xffffe410 in __kernel_vsyscall () #1 0xb7059df0 in raise () from /lib/tls/i686/cmov/libc.so.6 #2 0xb705b641 in abort () from /lib/tls/i686/cmov/libc.so.6 #3 0xb739270a in g_logv () from /usr/lib/libglib-2.0.so.0 #4 0xb7392749 in g_log () from /usr/lib/libglib-2.0.so.0 #5 0x0852ffb3 in Glib::exception_handlers_invoke () #6 0x08534e93 in Glib::SignalProxyNormal::slot0_void_callback () #7 0xb759e9d9 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0 #8 0xb759162b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #9 0xb75a23f1 in ?? () from /usr/lib/libgobject-2.0.so.0 #10 0x0ada1190 in ?? () #11 0x00000000 in ?? () ```