Re: posn-at-point get strange info when flycheck enable and (setq truncate-lines t)

["Feng Shu" <tumashu@163.com>]

Andreas Schwab <schwab@linux-m68k.org> writes:

> On Jan 17 2018, tumashu <tumashu@163.com> wrote:
>
>> When I enable flycheck and (setq truncate-lines t)
>> sometimes  posn-at-point get strange info like the below:
>>
>>
>>         (#<window 3 on test.el> 31 (65 . 111) 0 (! . 0) 31 (5 . 3) nil (0 . 24) (13 . 29))
>
> Strange in which way?

Sorry, it is flycheck's setting:

#+BEGIN_SRC emacs-lisp
(defcustom flycheck-indication-mode 'left-fringe
  "The indication mode for Flycheck errors and warnings.

This variable controls how Flycheck indicates errors in buffers.
May either be `left-fringe', `right-fringe', or nil.

If set to `left-fringe' or `right-fringe', indicate errors and
warnings via icons in the left and right fringe respectively.

If set to nil, do not indicate errors and warnings, but just
highlight them according to `flycheck-highlighting-mode'."
  :group 'flycheck
  :type '(choice (const :tag "Indicate in the left fringe" left-fringe)
                 (const :tag "Indicate in the right fringe" right-fringe)
                 (const :tag "Do not indicate" nil))
  :safe #'symbolp)

...
    (when flycheck-indication-mode
      (setf (overlay-get overlay 'before-string)
            (flycheck-error-level-make-fringe-icon
             level flycheck-indication-mode)))
...
#+END_SRC

flycheck will insert a picture with the help of overlay,

The problem I faced is that when I use posn-at-point to
get buffer POS's pixel position. it will get the picture's pixel position.

The two (X .Y) position is not equal, for example

  (#<window 3 on test.el> 31 (65 . 111) 0 (! . 0) 31 (5 . 3) nil (0 . 24) (13 . 29))
  (#<window 3 on test.el> 31 (65 . 87) 0 nil 31 (5 . 3) nil (0 . 0) (13 . 29))

Is it possible force get buffer POS's pixel position?




>
> Andreas.

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