fix #276149: Resizing bracket causes crash

[mattmcclinch]

See https://musescore.org/en/node/276149.

The problem is that layoutLinear() is called before the brackets are removed from the selection list. Moving this chunk of code further down in the function solves the problem.

Notice that the brackets are not re-selected after layoutLinear() is called. I tried to do this using the data stored in selectedBrackets, but it did not seem to work. It works better in Page View, but even then it may be a little buggy.

[mattmcclinch]

I also solved a problem described in https://musescore.org/en/node/273292.

[anatoly-os]

Interesting thing is that layoutLinear() is only about continuous view. But mentioned issues say nothing about Continuous view.

[mattmcclinch]

The score from issue 276149 opens in Continuous View by default. Bug reports do not always provide all the relevant information at first.