Debug console is not logging stdout and stderr immediately anymore, only once it encounters a newline

[rotemdan]

Does this issue occur when all extensions are disabled?: Yes

Version info:

Version: 1.79.0-insider (user setup)
Commit: 2c73d2651cc525b27fc697b820743098a204ec01
Date: 2023-05-04T22:11:08.187Z
Electron: 22.4.8
Chromium: 108.0.5359.215
Node.js: 16.17.1
V8: 10.8.168.25-electron.0
OS: Windows_NT x64 10.0.19045
Sandboxed: Yes

No extensions installed. Default settings.

Steps to Reproduce:

test.js:

process.stdout.write("Hello")

setTimeout(() => {
	process.stdout.write(" World!\n")
}, 5000)

.vscode/launch.json:

{
	"version": "0.2.0",
	"configurations": [
		{
			"type": "node",
			"request": "launch",
			"name": "Launch Program",
			"skipFiles": [
				"<node_internals>/**"
			],
			"program": "${workspaceFolder}\\test.js",
			"outputCapture": "std"
		}
	]
}

Expected behavior: The debug console should print "Hello" immediately, and after 5 seconds, print " World!".

Observed behavior: The entire string "Hello World!" is printed after a 5 second delay.

Immediate logging of stdout and stderr used to work in the debug console as long as I remember it. I suspect the problem started on the April 2023 release (or slightly earlier?). I don't know what caused this.