HistoryBrowser Graph menu doesn't update HistoryBrowser Graphs

[Philoul]

When you tune curves with graph menu, in Overview curves and graph settings are immediatly updated

Same action is not working within HB activity... (Graph settings are updated, but not HB graphs), so you will have to quit HistoryBrowser, and reopen it again to show new graph settings in HistoryBrowser

tested on latest dev (with or without #3306), so not linked to graph menu proposal...