Show toString() values in hover tooltips

[rothfels]

Similar to #315, it would be very useful to show the .toString of an object in the hover tooltip.

For example, in vanilla Eclipse debugger:

vs. in VS Code, you also have to expand the elements to see what's inside:

Steps To Reproduce

1. set breakpoint
2. hover over local variable

Current Result

See object explorer tooltip

Expected Result

Also see a useful .toString, as in Eclipse

[andxu]

@rothfels thank you for using our extension and opening up the concern for custom display, I can feel the eager needs to this feature, actually I used this feature to display a list in the replies of this issue, but due to the complicated logic of invoking evaluation engine and hard to bring manipulation ui in vscode for custom definition, the feature is not been put to start for now, but a quick/compromised solution may be only support a field and a method call without argument from a vscode workspace/project configuration, the com.microsoft.java.debug.core is a pure java maven project and perhaps a enthusiastic can contribute to that feature(we are on-progressing of providing documents to contributors about how to develop and test our extension), otherwise I would take a time for that.
the object formatter code is here, and the unit test code here

[fbricon]

Eclipse allows users to define custom detail formatter expressions in its debugger, so that you can get a sensible String representation of an object, even if it doesn't override toString() itself.

[rothfels]

This is awesome, thank you so much @testforstephen! 🎉