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ui: restore behavior to ignore some I/O errors (issue5658)...
ui: restore behavior to ignore some I/O errors (issue5658) e9646ff34d55 and 1bfb9a63b98e refactored ui methods to no longer silently swallow some IOError instances. This is arguably the correct thing to do. However, it had the unfortunate side-effect of causing StdioError to bubble up to sensitive code like transaction aborts, leading to an uncaught exceptions and failures to e.g. roll back a transaction. This could occur when a remote HTTP or SSH client connection dropped. The new behavior is resulting in semi-frequent "abandonded transaction" errors on multiple high-volume repositories at Mozilla. This commit effectively reverts e9646ff34d55 and 1bfb9a63b98e to restore the old behavior. I agree with the principle that I/O errors shouldn't be ignored. That makes this change... unfortunate. However, our hands are tied for what to do on stable. I think the proper solution is for the ui's behavior to be configurable (possibly via a context manager). During critical sections like transaction rollback and abort, it should be possible to suppress errors. But this feature would not be appropriate on stable.

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r30907:75149f84 stable
r33859:cde4cfeb stable
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hgignore.5.txt
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==========
hgignore
==========
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syntax for Mercurial ignore files
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:Author: Vadim Gelfer <vadim.gelfer@gmail.com>
:Organization: Mercurial
:Manual section: 5
:Manual group: Mercurial Manual
.. include:: hgignore.5.gendoc.txt
Author
======
Vadim Gelfer <vadim.gelfer@gmail.com>
Mercurial was written by Matt Mackall <mpm@selenic.com>.
See Also
========
|hg(1)|_, |hgrc(5)|_
Copying
=======
This manual page is copyright 2006 Vadim Gelfer.
Mercurial is copyright 2005-2017 Matt Mackall.
Free use of this software is granted under the terms of the GNU General
Public License version 2 or any later version.
.. include:: common.txt