Maybe it makes sense to make regions_transformer reversed by default

[srghma]

I can`t find why this will be for bad: if someone not only transform selected regions, but also edit text - then selection become stale

def regions_transformer_reversed(view, f):
    sels = reversed(view.sel())
    new = []
    for sel in sels:
        region = f(view, sel)
        if not isinstance(region, sublime.Region):
            raise TypeError('sublime.Region required')
        new.append(region)
    view.sel().clear()
    view.sel().add_all(new)