[Lazarus] Tools->Options segfaults with ancient gtk (GtkTreeView problem)

Luca Olivetti luca at wetron.es
Wed Dec 7 11:28:09 CET 2016

El 05/12/16 a les 22:26, Luca Olivetti via Lazarus ha escrit:
> El 05/12/16 a les 17:39, zeljko ha escrit:
>>> I changed the call to look like the one for gtk >= 2.14 (i.e, Path
>>> instead of nil) and now I can open the options dialog.
>>> I really don't know gtk2, but maybe the differentiation is needed for an
>>> earlier version of gtk and not 2.14?
>> Maybe < 2.12 should be there
> I wouldn't know, as I said I know nothing about gtk, but the available
> documentation doesn't mention if and when the api was changed:
> https://developer.gnome.org/gtk2/stable/GtkTreeView.html#gtk-tree-view-set-cursor

I checked gtktreeview.c starting from gtk 2.0

until gtk 2.24


and the implementation of gtk_tree_view_set_cell basically didn't change 
(apart form the introduction of gtk_tree_view_set_cursor_on_cell in gtk 

At the beginning of the function there is

g_return_if_fail (path != NULL);

so I guess path should never be null and the LCL implementation works 
just because nobody else is using an older gtk.

Maybe the function could be simplified to

           //gtk2 iter has no focus??
           Path := gtk_tree_path_new_from_string(PChar(IntToStr(AIndex)));
           if GTK_IS_TREE_VIEW(MainView) then
             gtk_tree_view_set_cursor(PGtkTreeView(MainView), Path, nil, 
           if GTK_IS_ICON_VIEW(MainView) then
             gtk_icon_view_set_cursor(PGtkIconView(MainView), Path, nil, 

of course I may be guessing wrong.

Should I file a bug report?

Luca Olivetti
Wetron Automation Technology http://www.wetron.es/
Tel. +34 93 5883004 (Ext.3010)  Fax +34 93 5883007

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