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KNOWN BUGS IN ZSH
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The pattern %?* matches names beginning with %? instead of names with at
least two characters beginning with %. This is a hack to allow %?foo job
substitution without quoting. This behaviour is incompatible with sh
and ksh and may be removed in the future. A good fix would be to keep
such patterns unchanged if they do not match regardless of the state of
the nonomatch and nullglob options.
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It is currently impossible to time builtins.
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38754: unwanted scrolling of the terminal
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40106: The comp* completion-related builtins (compadd, compset, etc) are
run with $_comp_options in effect, rather than the user's options.
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users/20807: vcs_info quilt 'addon' mode: hook lookup context specifies
the underlying VCS but not whether quilt is used.

Workaround: test (( ${+funcstack[(r)VCS_INFO_quilt]} )).
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41184: 'exec' optimization for last command in a subshell should be
skipped when STTY=... is set for that command.  This is complicated
because the decision to (not) fork is made in execcmd_exec() before
the prefix parameter assignments are examined in execute().
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41203 and others: Make it easier to maintain C modules out of tree.
(May require defining a stable API for modules, see 41254)
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44850 terminal issues with continuation markers
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users/24765 -direct terminals. Not a bug as such but we may need to do
  something if -direct values in TERM are ever common
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44850: zle -M doesn't work properly if the command line fills the screen
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44525, 45778 [PATCH] prompt redrawn on the wrong line upon SIGWINCH 
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45400: vared does not work in subshells, even when the parent shell is
interactive and the subshell is the foreground job.  The USEZLE option is
always turned off in subshells, for reasons lost to history.  There is a
related, probably obsolete, vared special case for $TERM set to "emacs".
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47561: [PATCH v4] vcs_info: choose backend by basedir
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48091: Bug in compdescribe with matcher 'b:-=+'
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users/26071: Strange behavior about option completion of "git push --f"
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