tasks.json support to reuse the same shell

[Llorx]

Just reopening this: https://github.com/microsoft/vscode/issues/168947 by @stawiski

I'd like to be able to "truly" reuse shell when running tasks from tasks.json that are dependent on each other. For example, I have a task that needs to activate python environment such as:

source ~/.pyenv/esp-idf/bin/activate

To perform a build using CMake my current task command (in tasks.json) looks something like this:

"command": "source ~/.pyenv/esp-idf/bin/activate && cmake ...

I have to repeat this pyenv activation across different tasks. Instead I would like to create another task called "setup" and make other tasks depend on it, such as:

{
    "label": "setup",
    "type": "shell",
    "command": "source ~/.pyenv/esp-idf/bin/activate"
},
{
    "label": "build",
    "type": "shell",
    "dependsOrder": "sequence",
    "dependsOn": [
        "setup"
    ],
    "command": "cmake ...",
    ...
},

However this seems to be currently not supported, as each task runs in a new shell. I tried using "panel": "shared" configuration option, but that only shares stdout of the terminals, it does not preserve shell between task commands.

Cheers

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