[Development] Merging qtquickcontrols2 into qtdeclarative

[Oswald Buddenhagen]

On Mon, Jul 12, 2021 at 02:17:01PM +0000, Tor Arne Vestbø wrote:
>One way to do this is with a prefixed subtree merge without squashing the history of controls2.
>
>What ossi (?) referred to was using git replace to inject the history of controls, but I’m not sure how that would look so perhaps he can outline that approach.
>
it would be actually also just a subtree merge, but of a re-import, to 
which the old history would be grafted (that is, git-replaced when using 
up-to-date git mechanisms).
that would avoid duplicating the history, which would make the repo 
somewhat smaller and leave us with only one authoritative copy of said 
history (the original module will have to stay around for quite a while 
and keep receiving fixes anyway).