LatexWalker.get_latex_nodes returns wrong "len" (sometimes)

[gamboz]

Working on the function that you proposed on #48, I came across a strange behavior: sometimes the len returned by the get_latex_nodes function is not the same as the len of the parsed node.
In the MWE below, the first node is a MacroNode and the pos and len reported by the function are the same as the attributes of the node itself, but for the second node (a CharsNode, the newline char), the function reports a len different from that of the node.

import pylatexenc.latexwalker

doc_content = r"""\emph{A}
\emph{B}"""
print(f"DOC: {doc_content}")

lw = pylatexenc.latexwalker.LatexWalker(
    doc_content,
    tolerant_parsing=False,
)

pos = 0
(tmp_list, npos, nlen) = lw.get_latex_nodes(pos, read_max_nodes=1)
node = tmp_list[0]
print(f"Node at pos {pos}: node len {node.len} == returned len {nlen}; OK")

pos = 8
(tmp_list, npos, nlen) = lw.get_latex_nodes(pos, read_max_nodes=1)
node = tmp_list[0]
print(f"Node at pos {pos}: node len {node.len} != returned len {nlen}; BAD")

By the way, with some minor tweaks, the function you proposed in #48 works well, thanks again 👍

[phfaist]

Wow, nice catch. I found the omission, fixed. The fix will be included in the next release. Thanks for reporting!