patch 8.2.5034: there is no way to get the byte index from a virtual column
Problem: There is no way to get the byte index from a virtual column.
Solution: Add virtcol2col(). (Yegappan Lakshmanan, closes #10477,
closes #10098)
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 80b7e38..11f035b 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -835,6 +835,7 @@
screencol() get screen column of the cursor
screenrow() get screen row of the cursor
screenpos() screen row and col of a text character
+ virtcol2col() byte index of a text character on screen
getcurpos() get position of the cursor
getpos() get position of cursor, mark, etc.
setpos() set position of cursor, mark, etc.