[issue25254] Idle: debugger source line highlighting fails again

[Mark Roseman]

Mark Roseman added the comment:

FYI, the new debugger UI has an option to only show highlights in already open 
files (i.e. don't open new ones)

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[issue25254] Idle: debugger source line highlighting fails again

[Terry J. Reedy]

Terry J. Reedy added the comment:

No.  Turning it on, I discovered why off is default. When it on, it sometimes 
does surprising things on IDLE.  For instance, print('x') is (usually) a 
builtin and can not be stepped into.  However, it calls 
sys.stdout.write('x'+'\n').  Under Idle, user process sys.stdout is 
PyShell.Pseudofile, so when source is checked, 'step' on a line with print 
opens the file and highlights lines in the write method.

Step should ask before opening a file, and/or a 'smart step' is needed.

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resolution:  -> not a bug
stage: test needed -> resolved
status: open -> closed

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[issue25254] Idle: debugger source line highlighting fails again

[Mark Roseman]

Mark Roseman added the comment:

Was the 'source' checkbox in the debugger checked?

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[issue25254] Idle: debugger source line highlighting fails again

[Terry J. Reedy]

New submission from Terry J. Reedy:

Re-occurrence of #14146. On that issue, msg225380, 2014-08-15, I said "Debugger 
source line highlighting works fine." I am really sure it was true when I 
posted previously, 2013-05-29.  In 3.4.3, Feb 24 2015, it is not working.  
Ditto for 2.7.10 and 3.5.0, released subsequently, and repository versions of 
2.7 and 3.4,  The problem is not the fix in #14146, which I tested separately 
before replacing it in #24972.

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components: IDLE
messages: 251746
nosy: markroseman, terry.reedy
priority: normal
severity: normal
stage: test needed
status: open
title: Idle: debugger source line highlighting fails again
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6

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