Inconsistent treatment of trailing whitespace in multiline strings

[daveware-nv]

Steps to reproduce

def example(*args):
    print(*args)


example(
    "bob", """
    foobar 
    more text
""",
)

example(
    "bob",
    """
    foobar2 
    more text
""",
)

Current behavior

pylint incorrectly warns about the trailing whitespace on the line with foobar2 and correctly ignores the trailing whitespace on the line with foobar.

Expected behavior

pylint should produce no trailing whitespace warnings, as all the occurrences are in literal strings.

pylint --version output

pylint 2.6.0
astroid 2.4.2
Python 3.7.8 (default, Jul 30 2020, 09:48:41)
[GCC 9.3.0]

[Pierre-Sassoulas]

I can reproduce, this is very surprising.