4b1d2b7ac82a2840982b7c1e9ff8363150e59963
When creating the editor, default modes are set, this toggles mouse-modes, in `Editor::mouse_mode_chosen` which in turn calls EditingContext::grid_type_chosen. With rulers-follow-grid enabled this can call `Editor::toggle_ruler_visibility`. Since `_session` is NULL during editor's c-tor this caused a crash in `Editor::store_ruler_visibility`.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html
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