Discovered when working on the gvfs-fuse-less patches.

Steps to reproduce:

1. Enable the saveactions plugin and enable "instant save". 2. Create new document (File->New). 3. Close the tab with the document.

The corresponding backtrace is

``` Thread 1 "geany" received signal SIGSEGV, Segmentation fault. 0x00007ffff58ecd8d in g_type_check_instance () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 (gdb) bt #0 0x00007ffff58ecd8d in g_type_check_instance () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #1 0x00007ffff58e1514 in g_signal_handlers_disconnect_matched () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #2 0x00007ffff79e547c in ScintillaGTKAccessible::~ScintillaGTKAccessible (this=0x1ea0cf0, __in_chrg=<optimized out>) at gtk/ScintillaGTKAccessible.cxx:165 #3 0x00007ffff79e54ea in scintilla_object_accessible_finalize (object=0x387b030) at gtk/ScintillaGTKAccessible.cxx:1180 #4 0x00007ffff58ccd9a in g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 #5 0x00007ffff662ab04 in atk_focus_tracker_notify () from /usr/lib/x86_64-linux-gnu/libatk-1.0.so.0 #6 0x00007ffff00a43e7 in ?? () from /usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libgail.so #7 0x00007ffff6a64d57 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0 #8 0x00007ffff53ed04a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #9 0x00007ffff53ed3f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #10 0x00007ffff53ed712 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #11 0x00007ffff6e2c6a7 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 #12 0x00007ffff79a1527 in main_lib (argc=1, argv=0x7fffffffde98) at libmain.c:1233 #13 0x00007ffff7367830 in __libc_start_main (main=0x4005a0 <main>, argc=1, argv=0x7fffffffde98, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffde88) at ../csu/libc-start.c:291 #14 0x00000000004005d9 in _start () ```