Bug: terminal width incorrect if changed in child process

[Devin Landes]

PLATFORM
bashver 3.00.16(1)-release
hardware: intel 32 bit
os: fedora core 4

BUG
If the terminal width is changed while a child process of bash is
running (e.g. less), bash does not notice the change when it regains
control and line wrapping for the commandline works incorrectly.

RECREATE
make terminal width very narrow (like 10 chars)
run bash
run less
make terminal width wide again
exit less
type in a long command on the commandline

FIX
bash should query the terminal size (and possibly other similar info
that might have changed) when returning from a child process.