Strange: when I call context menu from grid footer (mouse cursor is on footer)
or from grid header, and when call from context menu filter dialog - all works.
But when I call context menu from any grid row (mouse cursor is on any row),
and when call from context menu filter dialog:
(1) - If result of filtering - no rows shown, I have "sigmentation fault" in
Qtitan::GridRow::rowIndex() when move mouse on grid;
(2) - If result of filtering - any rows shown, all works ok;
And later I can set filtering like in (1), and all works ok.