[UI] Discrepencies between the number of errors and the errors displayed

[lesquoyb]

Describe the bug
I'm running a model with many compilation errors, and I noticed that the displayed number of errors is way higher than the actual number of errors showed when expanding the menu:

I think this is because many of those "errors" are just many imports of the files containing the actual errors

Expected behavior
That the total number of errors equals the number of errors present

[AlexisDrogoul]

@lesquoyb can you test again, for instance with Maelia ? I might have solved it (but I prefer to be sure).

[AlexisDrogoul]

Available in #608 ;-)