Terry J. Reedy <tjre...@udel.edu> added the comment:
'│' is a bit taller that ascii bar '|'; hex(ord('│')) = '0x2502'. It is a bit
heavy. In this Windows Firefox box it is slightly lighter than | but in IDLE
with Source Code Pro, it is slightly darder. Worse is being centered instead
of on one edge.
We would have to check it with multiple fixed-ascii-pitch fonts on multiple
systems before using any non-ascii char. Does it always have the exact width
of ascii ' ' or easier to check, ascii '|', so that is does not change the
indent? This is easily tested in the Settings dialog Font tab sample box.
Paste the following
│││││││││││││││
|||||||||||||||
It passes with all but one of the Windows mono fonts I tried.
I may ask a tk/tkinter question on SO about other possible options. Testing
this one in code:
if a: # Put 1st bar on 4th space.
if b:
│ if c:
│ │ pass
if d:
│ pass
if a: # Put 1st bar on 5th space.
if b:
│ if c:
│ │ pass
if d:
│ pass
if a: # Put 1st bar on 1st space.
│ if b:
│ │ if c:
│ │ │ pass
│ if d:
│ │ pass
The 2nd option looks best to me. The 3rd would be easier to program, as
default tab indent would always be '│ '. In any case, copied code would not
be runnable code. I would add this on the Option menu between Code Context and
Line Numbers.
I believe only updating the markers on demand would be much easier to program
than dynamically updating them with each keystroke (checking key and whether
whitespace in indent area).
Before merging a PR (writen by someone else), someone other than me, such as
Raymond, must test it in real use both for correctness, usefulness, and
aesthetics. (I anticipate that I would fail it on the latter two.)
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<https://bugs.python.org/issue46666>
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