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runtime(doc): make :h virtcol() more accurate

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The current description (especially the "unlimited width" part) is
inaccurate in several ways:
- The size of virtual text can depend on window width. In particular,
  the size of "above" virtual text can be equal to window width.
- A double-width character that doesn't fit adds 1 to the virtual column
  of the following characters.
- The size of 'showbreak' and 'breakindent' is counted.

related: #5713
closes: #18447

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
zeertzjq
2025-10-01 18:30:38 +00:00
committed by Christian Brabandt
parent 21d40d2d41
commit 014c731fa5
1 changed files with 4 additions and 4 deletions
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8
runtime/doc/builtin.txt
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@@ -1,4 +1,4 @@
*builtin.txt* For Vim version 9.1. Last change: 2025 Sep 29
*builtin.txt* For Vim version 9.1. Last change: 2025 Oct 01
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -12346,9 +12346,9 @@ values({dict}) *values()*
virtcol({expr} [, {list} [, {winid}]]) *virtcol()*
The result is a Number, which is the screen column of the file
position given with {expr}. That is, the last screen position
occupied by the character at that position, when the screen
would be of unlimited width. When there is a <Tab> at the
position given with {expr}. That is, the total number of
screen cells occupied by the part of the line until the end of
the character at that position. When there is a <Tab> at the
position, the returned Number will be the column at the end of
the <Tab>. For example, for a <Tab> in column 1, with 'ts'
set to 8, it returns 8. |conceal| is ignored.