Cannot run Manim commands when it's started 2nd time (MacOS)

[VladimirFokow]

On macOS, after starting Manim and then quitting it - it doesn't run again.

For example:

• start a Manim window (with any method)
• finish it (with any method)

After that - problems:

• "Preview Manim Cell" -
  doesn't work, raises a notification:

  Simultaneous Manim commands are not currently
  supported on MacOS. Please wait for the current
  operations to finish before initiating a new command.

• "Preview selection" command -
  doesn't work, same notification.

• start manimgl via a terminal - works (it starts).
  But then the "Preview Manim Cell" , "Preview selection" commands continue NOT working - having the same behavior..

[bhoov]

I can confirm this bug. Another important fix before release...

@VladimirFokow we should probably dive into the ManimShell.ts code to help @Splines with this implementation. He doesn't have a way to debug things on his end. It's actually quite frustrating these diff behaviors between WSL and MacOS -- I thought Electron was supposed to solve these issues 😂 lol

I suggest tackling some of the MacOS facing integration tests suggested in #47 as we try to resolve these OS conflicts. This is my first extension in VS Code, and it will also be my first attempt at testing in TS 🙈, but it will be very valuable. We can keep the tests local for now (i.e., running the suite on @Splines windows machines and our MacOS machines) and figure out how to integrate a CI pipeline later

[VladimirFokow]

Log 1:

Manim Notebook.log

To show that:

• 2nd time when manim is running:
  we can't execute code with manim notebook commands (they think the 1st session is still running)

Code:

from manimlib import *

class MyScene(Scene):
    def construct(self):
        #
        ## Test
        circle = Circle()
        self.play(ShowCreation(circle))

Steps:

• reload window
• start logging, select "manim notebook", "trace"
• click "preview manim cell" (works fine: starts manim)
• command: "quit preview"
• click "preview manim cell" -> broken (shows warning, doesn't start manim, doesn't run)
• command: start manim, on line 5 (works fine: starts manim)
• click "preview manim cell" -> broken (shows warning, doesn't run)
• select code and run it -> also broken (shows warning, doesn't run)

[Splines]

It's actually quite frustrating these diff behaviors between WSL and MacOS -- I thought Electron was supposed to solve these issues 😂 lol

@bhoov Yes, these differences are frustrating. But I'm not sure it's Electron's fault. We're dealing with a terminal and I suspect that communicating with underlying layers might reveal more difference shere than in other areas where "just" a regular Chromium browser is used and that is abstracted away in higher layers than the "bare-bone" terminal.

---

Here's what I did:

@VladimirFokow Thank you very much for the logfile and the enumeration of steps you've performed, this will hopefully make it possible for me to fix the issue in the following days.