bug#70617: 30.0.50; python-indent-shift-right indents left when line is whitespace

[kobarity]

Eli Zaretskii wrote:
> 
> > From: Patrick Poitras <patrick.f.poitras@gmail.com>
> > Date: Sat, 27 Apr 2024 16:16:46 -0700
> > 
> > Hi all.
> > 
> > I've noticed this weird behavior of python-indent-shift-right.
> > 
> > Let's say I have a block of code. The "|" character represents my cursor
> > 
> > In a python file, I write
> > 
> > if True:
> > |
> > 
> > (... file contents continue)
> > 
> > and then call python-indent-shift-right on an empty line. It does nothing. 
> > If the second line has any amount of
> > spaces, the whitespace is entirely deleted. 
> > 
> > Given that Python's whitespace is syntactically significant, the expected 
> > behavior should be to add an indent
> > to an empty line, or to prepend 4 characters (or 8, given user choice) to 
> > the empty line if it has whitespace.
> > From a cursory glance, I think we're running into some behavior of 
> > indent-rigidly that tries to prevent the
> > addition of superfluous white space following an indented block of code. I 
> > assume this would be potentially
> > desirable for languages with non-significant whitespace, but in the case of 
> > the python-specific function, the
> > resulting behavior defies both the function name and description.
> 
> Any comments?

Hi Patrick,

I believe this behavior is intended to avoid adding extra whitespaces
when processing a region containing blank lines.  There may be an
approach to change to indent even a blank line as a special case when
the region is not active, but I personally think that Enter or TAB
indentation is sufficient in such cases.