Hi all,

Someone surely must see an easy fix for this annoying bug I ran into the other day. ~suv reported that scrolling the canvas using the scroll wheel is prohibited when the pointer is hovering above the snap indicator (see the last paragraph of this comment: https://bugs.launchpad.net/inkscape/+bug/522335/comments/8). This becomes very reproducible and annoying when using a dense grid, together the pre-snap indicator, in for example the rectangle context. Through debugging I learned that the scroll events reach sp_canvas_scroll() (just as they should), and from which they should be dispatched via emit_event() (in sp-canvas.cpp). But this only works if the canvas->current_item has been set, but in this situation the current-item is null.

Now my question is: what should the current-item be set to in this case, and how do I control this?

Thanks,

Diederik

PS: This is a stack trace of how things should work, in this case there was no grid and therefore no snap-indicator was drawn:

Thread [1] (Suspended: Breakpoint hit.) 31 sp_canvas_scroll_to() /home/diedenrezi/InkscapeBZR/inkscape/src/display/sp-canvas.cpp:2179 0x00000000006161fa 30 SPDesktop::scroll_world() /home/diedenrezi/InkscapeBZR/inkscape/src/desktop.cpp:1110 0x0000000000a744f6 29 sp_event_context_private_root_handler() /home/diedenrezi/InkscapeBZR/inkscape/src/event-context.cpp:707 0x000000000046279f 28 sp_rect_context_root_handler() /home/diedenrezi/InkscapeBZR/inkscape/src/rect-context.cpp:448 0x0000000000af5f6d 27 sp_event_context_virtual_root_handler() /home/diedenrezi/InkscapeBZR/inkscape/src/event-context.cpp:941 0x0000000000463222 26 sp_event_context_root_handler() /home/diedenrezi/InkscapeBZR/inkscape/src/event-context.cpp:937 0x00000000004631ed 25 sp_desktop_root_handler() /home/diedenrezi/InkscapeBZR/inkscape/src/desktop-events.cpp:67 0x0000000000a7a682 24 sp_marshal_BOOLEAN__POINTER() /home/diedenrezi/InkscapeBZR/inkscape/src/helper/sp-marshal.cpp:352 0x00000000006cf763 23 g_closure_invoke() 0x0000003e9180ba8e 22 <symbol is not available> 0x0000003e91820ec3 21 g_signal_emit_valist() 0x0000003e918220ec 20 gtk_signal_emit() 0x00000031668e3bd2 19 emit_event() /home/diedenrezi/InkscapeBZR/inkscape/src/display/sp-canvas.cpp:1348 0x0000000000613f57 18 sp_canvas_scroll() /home/diedenrezi/InkscapeBZR/inkscape/src/display/sp-canvas.cpp:1581 0x0000000000614928 17 <symbol is not available> 0x0000003166753a33 16 g_closure_invoke() 0x0000003e9180ba8e 15 <symbol is not available> 0x0000003e91820b8d 14 g_signal_emit_valist() 0x0000003e918220ec 13 g_signal_emit() 0x0000003e918227a3 12 <symbol is not available> 0x000000316687620f 11 gtk_propagate_event() 0x000000316674a794 10 gtk_main_do_event() 0x000000316674b8d3 9 snooper() /home/diedenrezi/InkscapeBZR/inkscape/src/main.cpp:896 0x000000000044d569 8 <symbol is not available> 0x0000003166e5fe9c 7 g_main_context_dispatch() 0x0000003e9143920e 6 <symbol is not available> 0x0000003e9143cbf8 5 g_main_loop_run() 0x0000003e9143d045 4 gtk_main() 0x000000316674be07 3 sp_main_gui() /home/diedenrezi/InkscapeBZR/inkscape/src/main.cpp:962 0x000000000044db86 2 Inkscape::NSApplication::Application::run() /home/diedenrezi/InkscapeBZR/inkscape/src/application/application.cpp:114 0x00000000005acada

1 main() /home/diedenrezi/InkscapeBZR/inkscape/src/main.cpp:698 0x000000000044cf9e