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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 VIM REFERENCE MANUAL by Bram Moolenaar
@@ -12346,9 +12346,9 @@ values({dict}) *values()*
virtcol({expr} [, {list} [, {winid}]]) *virtcol()* virtcol({expr} [, {list} [, {winid}]]) *virtcol()*
The result is a Number, which is the screen column of the file The result is a Number, which is the screen column of the file
position given with {expr}. That is, the last screen position position given with {expr}. That is, the total number of
occupied by the character at that position, when the screen screen cells occupied by the part of the line until the end of
would be of unlimited width. When there is a <Tab> at the the character at that position. When there is a <Tab> at the
position, the returned Number will be the column at the end of position, the returned Number will be the column at the end of
the <Tab>. For example, for a <Tab> in column 1, with 'ts' the <Tab>. For example, for a <Tab> in column 1, with 'ts'
set to 8, it returns 8. |conceal| is ignored. set to 8, it returns 8. |conceal| is ignored.