vim-patch:9.1.1083: setreg() doesn't correctly handle mbyte chars in blockwise mode

Problem:  setreg() doesn't correctly handle mbyte chars in blockwise
          mode
Solution: use mb_ptr2len_len function pointer (Yee Cheng Chin)

setreg() will automatically calculate the width when a blockwise mode is
specified, but it does not properly calculate the line widths of mbyte
characters when value is passed as newline-terminated string. It does
work when value is passed as a list of lines though.

Fix this by properly using the mbyte function pointer to increment the
loop counter.

closes: vim/vim#16596

https://github.com/vim/vim/commit/a17f8bfb282805ee8ded014089d3094ef6dbf913

Co-authored-by: Yee Cheng Chin <ychin.git@gmail.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/test/old/testdir/test_registers.vim b/test/old/testdir/test_registers.vim
index e5add9414f..fbacdaa2a0 100644
--- a/test/old/testdir/test_registers.vim
+++ b/test/old/testdir/test_registers.vim
@@ -435,6 +435,23 @@ func Test_set_register()
   enew!
 endfunc
 
+" Test for blockwise register width calculations
+func Test_set_register_blockwise_width()
+  " Test for regular calculations and overriding the width
+  call setreg('a', "12\n1234\n123", 'b')
+  call assert_equal("\<c-v>4", getreginfo('a').regtype)
+  call setreg('a', "12\n1234\n123", 'b1')
+  call assert_equal("\<c-v>1", getreginfo('a').regtype)
+  call setreg('a', "12\n1234\n123", 'b6')
+  call assert_equal("\<c-v>6", getreginfo('a').regtype)
+
+  " Test for Unicode parsing
+  call setreg('a', "z😅😅z\n12345", 'b')
+  call assert_equal("\<c-v>6", getreginfo('a').regtype)
+  call setreg('a', ["z😅😅z", "12345"], 'b')
+  call assert_equal("\<c-v>6", getreginfo('a').regtype)
+endfunc
+
 " Test for clipboard registers (* and +)
 func Test_clipboard_regs()
   throw 'skipped: needs clipboard=autoselect,autoselectplus'