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zsh 5.6 doesn't get terminal size change information with "less"

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From: Vincent Lefevre <vincent@xxxxxxxxxx>
To: zsh-workers@xxxxxxx
Subject: zsh 5.6 doesn't get terminal size change information with "less"
Date: Wed, 12 Sep 2018 02:44:21 +0200
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Another major regression in zsh 5.6 and zsh 5.6.1 (tested with both
xterm and GNOME Terminal):

1. Open the terminal to some size.
2. View a file with "less" (do not quit).
3. Change the size of the terminal.
4. Quit "less".

The terminal becomes unusable (at least if the size has been reduced)
because zsh did not notice the change. If I echo $COLUMNS and $LINES,
they still have their old values.

-- 
Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Follow-Ups:
- Re: zsh 5.6 doesn't get terminal size change information with "less"
  - From: Peter Stephenson

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