Which innovations (like MVC, xunit, Hotspot) did Smalltalk bring?

Question

I find more and more aspects where Smalltalk was the innovator, i.e. created the technique or at least the overall concept for the first time. I can think of the following:

• xunit approach
• IDE concepts
• VM optimizations
• fluent interfaces
• several design patterns (e.g. model-view-controller)
• the class-free prototype paradigm.

Are all of these correct? Which further innovations did Smalltalk bring?

I'm sure there are more (e.g. in the field of language design?)

Answer 1

• The mouse
• Unit Testing
• Refactoring
• Scavenging GC
• image concept (snapshot)