[vim/vim] Multi-line visual block `1v` past EOL (virtualedit) has incorrect size (Issue #20746)

[Alex Yang]

aycyang created an issue (vim/vim#20746)

Steps to reproduce

1. Invoke Vim with no vimrc and this test file: printf "###\n###\n###\n#####\n" | vim -u NONE -

   The buffer should look like this:

   ###
   ###
   ###
   #####
   

2. Move cursor to first character: gg

3. Enter Visual block mode: ^v

4. Yank a 3x3 selection: lljjy

5. Turn on virtualedit: :set virtualedit=all

6. Move cursor to line 2, column 6 (any column >= 5 will do): :call cursor(2, 6)

7. 1v

At this point I observe a selection size of 1x3, but it should be 3x3.

Other notes:

• Bug seems to trigger only when the starting line is 2 or more characters shorter than the ending line.

Expected behaviour

Visual block mode selection should be of size 3x3.

Version of Vim

9.2.0782

Environment

OS: macOS Tahoe 26.5.1 (25F80)
Terminal: iTerm2 3.6.11
$TERM: xterm-256color
Shell: GNU bash, version 5.3.3(1)-release (aarch64-apple-darwin24.4.0)

Logs and stack traces

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