#1454 Set change history when save point is reached

[Zufu Liu]

As enable change history has no effect when there are undo history, it seems better to auto enable it after save point is reached.
single line addition in Editor::NotifySavePoint(bool isSavePoint):

if (changeHistoryOption != ChangeHistoryOption::Disabled) {
    pdoc->ChangeHistorySet(FlagSet(changeHistoryOption, ChangeHistoryOption::Enabled));
    Redraw();
}

[Neil Hodgson]

The benefit is unclear - it seems to just relax the order of calls slightly.

[Zufu Liu]

If not set here, application that allows enable/disable change history will need to set it in SCN_SAVEPOINTREACHED.

[Neil Hodgson]

But it won't work in general for SCN_SAVEPOINTREACHED only at the point undo is enabled so why wouldn't the application enable change history when enabling undo?

[Neil Hodgson]

I'm not understanding the point of this change so won't be including it.