[Fluxus] couple of editor fixes

[Kassen]

>
>
> great! thanks a lot for these. do you think it is stable enough that we can
> cherry-pick it to master?
>
>
I think so. I'd take that batch and the ctrl+t stuff as that's really handy
and a bit related. The one thing that was causing stability issues was that
before I fixed the cursor jump at removing blocks of text deleting could
crash, but with my fix there this should always be stable.

I would recommend merging them in as it's quite a improvement for day to day
editing. I would also like to point out that doing stuff like this makes you
appreciate all of the little features that editors have that you never
consider consciously :¬)

Yours,
Kas.
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