Risk of overwriting a macro in a library

[manufino]

The DialogSymbolize generates a key for the selected library by default upon opening.
If the library is changed, the key is not regenerated, which can lead to overwriting a macro in a library.

We need to implement a system that regenerates a free key each time the library is changed from the combobox.
Additionally, it's better to create a check during the macro insertion phase that, if a key already exists, asks the user if they want to replace it.
I would remove the default text "name:" that is inserted into the macro name, and instead display a message if it is not filled in.

[manufino]

@DarwinNE, I believe I've resolved this issue with commit 9b8f524. If you can confirm that everything is working correctly now, we can close it.

[DarwinNE]

Great, thank you. Let's close this one for now.
We are going to release 0.24.9 alpha so that we can get some feedback.