live-preview: Fix size being displayed wrongly #6134
Merged
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Stop abusing the init callback, abuse the changed callback instead ;-)
Also merge the initial size calculation into one place. This fixes the preview showing the wrong sizes. It does introduce a bit of flicker though as the UI is rendered in the wrong state once and then immediently corrects itself.
That is annoying, but strictly better than staying in the wrong state till the user does something.
Closes: #5954