Change buttonbar in another instance

[MVV]

As TC can't handle this fully, I treat it as a bug.

Easiest way to reproduce:

1. Open TWO (at least) instances of same TC installation.
2. Switch to any instance and edit buttonbar: add any button (e.g. separator) in its beginning (left buttonbar side).
3. Switch to another instance and try to read button's hints or execute any button - icons will remain but hints and actions will change according to button indexes in new buttonbar file.

Available ways to resolve:

1. Cache whole loaded buttonbar and use hints/actions from cache.
2. Update buttonbar icons when buttonbar file changes.

[MVV]

Also such buggy behaviour appears when I e.g. add or remove internal association with low index - another TC instance tries to perform action for wrong extension.

I can't find any reason why TC doesn't keep all settings in memory and takes them from INI everytime - its much longer and borns bugs like this.

[ghisler(Author)]

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