Implement persistence of the column layout in the History view.

I am considering saving the column widths in the History view so as to set column widths to what the user has once configured.

Currently, I can set the column widths once I am viewing the history of file A but as soon as file B is selected in a view sync'ed to the History view, the column widths I have thus defined are ignored and the layout is reset to the default.

If implemented, the widths once defined by the user will become the new default layout and be reused across file selections and even across sessions.