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This patch makes 'next-completion' and 'previous-completion' work
in the vertical completions format analogously to how they work in
the default horizontal format (bug#78959). It also fixes wrapping
in the vertical format and confines navigation (including
wrapping) in column-wise movement in the vertical format to the
current line, analogously to how navigation (including wrapping)
in line-wise movement in the horizontal format is confined to the
current column.
* doc/emacs/mini.texi (Completion): Fix several typos and improve
wording is several places.
(Completion Commands): Document navigation of the *Completions*
buffer in the vertical format. Document the difference between
format-sensitive movement and strictly column-wise or line-wise
movement. Document 'minibuffer-complete-and-exit' and update the
documentation of 'minibuffer-completion-auto-choose' and
'minibuffer-choose-completion'. Document the use of a numeric
prefix argument with the navigation commands.
(Completion Options): Rearrange and improve documentation of
'completions-sort', 'completions-format' and
'completion-auto-wrap', updating the latter to document the new
behavior.
* lisp/minibuffer.el (minibuffer-visible-completions-map): Rebind
"<left>" to 'minibuffer-previous-column-completion' and "<right>"
to 'minibuffer-next-column-completion'.
(minibuffer-next-completion): Add check for whether completions
format is vertical to decide whether to call
'next-line-completion' and replace calling 'next-completion' by
'next-column-completion'.
(minibuffer-next-column-completion)
(minibuffer-previous-column-completion): New commands.
* lisp/simple.el (completion-list-mode-map): Rebind "<left>" to
'previous-column-completion' and "<right>" to 'next-column-completion'.
(last-completion): Add handling for vertical completions format.
(completion--move-to-candidate-end): Always move point to the
position immediately after the last character of the completion
candidate. This unifies the behavior, simplifies the
implementation and facilitates implementing the improved
navigation of the *Completions* buffer.
(previous-column-completion, next-column-completion): New
commands, replacing the previous definitions of
'previous-completion' and 'next-completion' to reflect their
column-wise operation. Confine navigation (including wrapping) in
vertical format to the current line.
(previous-line-completion, next-line-completion): Implement
line-wise navigation (including wrapping) through all completions
in vertical format, not just those in the current column as in
horiztonal format. Update doc strings.
(next-completion, previous-completion): Redefine to call
'{next,previous}-line-completion' when completions format is
vertical and '{next,previous}-column-completion' otherwise.
* test/lisp/minibuffer-tests.el
(completions-format-navigation--tests): New function providing a
template to define tests of the navigation and wrapping behavior
with specified numbers of completion candidates.
(completions-format-navigation-test-{2,3,4,5,10,15,16}): New tests.
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