Attempting to prevent multiple indentions of notes

[colinmford]

This should fix #71 if approved.

It uses regex to remove the first tab in each line of a multi-paragraph text block.

Test added to make sure

<note>
	Line1
	Line2
	Line3
</note>

does not change when it goes through _normalizeGlifNote into something like

<note>
	Line1
		Line2
		Line3
</note>

etc.

[colinmford]

Update:

Instead of using regex to remove the first tab, instead the text is split on this regex:

r"[\n|\r|\r\n]\t*"

Should match cross-platform newlines, plus a tab character if it's present. Results in a nice clean list:

NEWLINE_RE = re.compile(r"[\n|\r|\r\n]\t*")
text = "List1\n\tList2\n\tList3"
NEWLINE_RE.split(text)
>>> ("List1", "List2", "List3")

It replaces a .splitlines() function, however, which technically matches all of these below. I thought it was unlikely, but if we need to support any or all of the additional characters we could add them to the regex.

Representation	Description
\n	Line Feed
\r	Carriage Return
\r\n	Carriage Return + Line Feed
\v or \x0b	Line Tabulation
\f or \x0c	Form Feed
\x1c	File Separator
\x1d	Group Separator
\x1e	Record Separator
\x85	Next Line (C1 Control Code)
\u2028	Line Separator
\u2029	Paragraph Separator

[colinmford]

Update based on @alerque suggestion:

Removes Regex and uses textwrap.dedent() to fix the multiple indention issue, but breaks this test

ufoNormalizer/tests/test_ufonormalizer.py

Lines 831 to 837 in 5b67c7a

	element = ET.fromstring(
	"<note> Line1 \t\n\n Line3\t </note>")
	writer = XMLWriter(declaration=None)
	_normalizeGlifNote(element, writer)
	self.assertEqual(
	writer.getText(),
	"<note>\n\tLine1\n\t\n\t Line3\n</note>")

[colinmford]

I made some revisions, following the advice that @benkiel made here. Now all tests are passing.

I added a dedent_tabs method that works like textwrap.dedent, but it will only dedent tabs and 4-space indentions.
https://github.com/colinmford/ufoNormalizer/blob/440f6a53f1e30be597393f76967f8ac1e528da27/src/ufonormalizer.py#L1367-L1416

This and a few extra lines of stripping allow all the tests to pass:
https://github.com/colinmford/ufoNormalizer/blob/440f6a53f1e30be597393f76967f8ac1e528da27/src/ufonormalizer.py#L1179-L1182

Finally, added additional tests to test for the case @benkiel brought up and other related cases:
https://github.com/colinmford/ufoNormalizer/blob/440f6a53f1e30be597393f76967f8ac1e528da27/tests/test_ufonormalizer.py#L848-L884

[moyogo]

Thanks @colinmford!

[colinmford]

Thanks @benkiel and @moyogo!