Remember least recently debugged main class

[Eskibear]

When I have multiple main classes in current workspace, after pressing F5 the debugger pops up a list of main class to let me choose. (sorted alphabetically)

When I need to re-launch to debug the same main class, every time I have to look for it again in the list. Is it possible to remember the LRU main class, and put it ahead of the list. It improves my experience.

[testforstephen]

Another feedback is to put the mainClass from currently focused editor in the top of the list too.

[testforstephen]

When there are multiple main classes in the workspace, we suggest leave mainClass empty in launch.json. Press F5, the debugger will prompt the available mainClass dynamically.

Below is the recommended launch config for multiple main classes scenario.

        {
            "type": "java",
            "name": "Debug (Launch)",
            "request": "launch",
            "cwd": "${workspaceFolder}",
            "console": "internalConsole",
            "stopOnEntry": false,
            "mainClass": "",
            "args": ""
        }

The new idea is to improve the display order of main class dropdown.

• Put recently used main class in the top.
• Put main class from active editor in the top. If it's not the most recently used one, then put it to the second top.

[testforstephen]

PR #372 merged. Close it.