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org-agenda-prepare-buffers: Avoid quadratic complexity when merging tags

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* lisp/org.el (org-agenda-prepare-buffers): Use the shortest list as
the first argument in `org--tag-add-to-alist'.

`org--tag-add-to-alist' is looping over the first argument.  When we
use the accumulated tags as the first argument, each buffer tag will
need to be looped over N_buffers/2 times on average, creating
quadratic complexity.  Avoid this.

Reported in https://orgmode.org/list/62f66552.050a0220.ed346.ac05SMTPIN_ADDED_BROKEN@mx.google.com
This commit is contained in:
Ihor Radchenko 2022-08-13 14:45:01 +08:00
parent b8a0ddf52f
commit 6ad65f3332
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1 changed files with 2 additions and 2 deletions
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@ -15196,8 +15196,8 @@ When a buffer is unmodified, it is just killed. When modified, it is saved
(append org-todo-keyword-alist-for-agenda org-todo-key-alist))
(setq org-tag-alist-for-agenda
(org--tag-add-to-alist
org-tag-alist-for-agenda
org-current-tag-alist))
org-current-tag-alist
org-tag-alist-for-agenda))
;; Merge current file's tag groups into global
;; `org-tag-groups-alist-for-agenda'.
(when org-group-tags