[ python-Bugs-984870 ] curses: getmaxyx() breaks when the window shrinks

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Bugs item #984870, was opened at 2004-07-04 07:33
Message generated for change (Comment added) made by akuchling
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Category: Extension Modules
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Matthias Klose (doko)
>Assigned to: Nobody/Anonymous (nobody)
Summary: curses: getmaxyx() breaks when the window shrinks

Initial Comment:
[forwarded from http://bugs.debian.org/257472]

When derived windows of stdscr have been created,
shrinking the terminal produces a KEY_RESIZE event, but
getmaxyx() returns the previous terminal size. Only by
increasing the window size does it return the correct
terminal dimensions.

A minimal script to show this effect is included below.

#!/usr/bin/python
import curses, sys

def init_display(stdscr):
    stdscr.clear()
    stdscr.refresh()
    size = stdscr.getmaxyx()
    sys.stderr.write("Now %u x %u\n" % (size[1],size[0]))
    rootwin = stdscr.derwin(20, 50, 0, 0)
    return rootwin

def main(stdscr):
    rootwin = init_display(stdscr)
    while 1:
        input = rootwin.getch()
        if ( input == curses.KEY_RESIZE):
            init_display(stdscr)
        elif input == ord("q"):
            sys.exit()
        rootwin.refresh()

curses.wrapper(main)




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>Comment By: A.M. Kuchling (akuchling)
Date: 2004-07-07 09:19

Message:
Logged In: YES 
user_id=11375

Confirmed.  I suspect this is a problem in ncurses, and will
write a C equivalent of the test program to verify this. 
The ncurses man page for derwin says: "The  subwindow 
functions  (subwin,  derwin, ...) are flaky,   incompletely
implemented, and not well tested," so an ncurses bug seems
likely.



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