ptvsd opens file in another tab on breakpoint hit in attach

[karthiknadig]

This occurs on windows. see test.py opened up in a separate window.

Repro code, this is the same code from our docs:

import random
import ptvsd

ptvsd.enable_attach()
print("test!!!!!!!!!!!!!!!!!!!! wait for attach")
ptvsd.wait_for_attach()
print('ptvsd version: %s' % ptvsd.__version__)
guesses_made = 0
name = input('Hello! What is your name?\n')
number = random.randint(1, 20)
print('Well, {0}, I am thinking of a number between 1 and 20.'.format(name))

while guesses_made < 6:
    guess = int(input('Take a guess: '))
    guesses_made += 1
    if guess < number:
        print('Your guess is too low.')
    if guess > number:
        print('Your guess is too high.')
    if guess == number:
        break
if guess == number:
    print('Good job, {0}! You guessed my number in {1} guesses!'.format(name, guesses_made))
else:
    print('Nope. The number I was thinking of was {0}'.format(number))

This used to work in 4.1.1a1.
@DonJayamanne , @ericsnowcurrently

[ericsnowcurrently]

FWIW, I'm not able to reproduce this on linux (using VSC).

[karthiknadig]

This occurs only on windows. I suspect it is the drive letter capitalization, that might be causing this.

[DonJayamanne]

I'll look into this.

[DonJayamanne]

Will submit PR, fix requires a change in both PTVSD as well as VSC Python Extension