[Bf-committers] Attribute locking - UI feature

[Antony Riakiotakis]

Sometimes it can be desirable to lock two or more attributes together so
that changing one changes the other too.

Some examples on that are image dimensions (so aspect ratio remains the
same) and object scale (so changing one attribute changes the scale of the
whole object).

I was thinking that this won't be hard to enforce, it may be possible to do
on RNA level (property update).

Options could be flags on image/object level.

Any objections or suggestions from UI team?

Also there may be other cases of similar scaling elsewhere to be considered
for inclusion.