vim-patch:8.2.1511: putting a string in Visual block mode ignores multi-byte

Problem:    Putting a string in Visual block mode ignores multi-byte
            characters.
Solution:   Adjust the column for Visual block mode. (closes vim/vim#6767)
cd94277f72

src/nvim/ops.c

@@ -3238,21 +3238,43 @@ void do_put(int regname, yankreg_T *reg, int dir, long count, int flags)
       --lnum;
     new_cursor = curwin->w_cursor;
 
-    // simple case: insert into current line
+    // simple case: insert into one line at a time
     if (y_type == kMTCharWise && y_size == 1) {
       linenr_T end_lnum = 0;  // init for gcc
+      linenr_T start_lnum = lnum;
 
       if (VIsual_active) {
         end_lnum = curbuf->b_visual.vi_end.lnum;
         if (end_lnum < curbuf->b_visual.vi_start.lnum) {
             end_lnum = curbuf->b_visual.vi_start.lnum;
         }
+        if (end_lnum > start_lnum) {
+          // "col" is valid for the first line, in following lines
+          // the virtual column needs to be used.  Matters for
+          // multi-byte characters.
+          pos_T pos = {
+            .lnum = lnum,
+            .col = col,
+            .coladd = 0,
+          };
+          getvcol(curwin, &pos, NULL, &vcol, NULL);
+        }
       }
 
       do {
         totlen = (size_t)(count * yanklen);
         if (totlen > 0) {
           oldp = ml_get(lnum);
+          if (lnum > start_lnum) {
+            pos_T pos = {
+              .lnum = lnum,
+            };
+            if (getvpos(&pos, vcol) == OK) {
+              col = pos.col;
+            } else {
+              col = MAXCOL;
+            }
+          }
           if (VIsual_active && col > (int)STRLEN(oldp)) {
             lnum++;
             continue;

src/nvim/testdir/test_visual.vim

@@ -432,3 +432,14 @@ func Test_Visual_Block()
 
   close!
 endfunc
+
+func Test_visual_put_in_block()
+  new
+  call setline(1, ['xxxx', 'y∞yy', 'zzzz'])
+  normal 1G2yl
+  exe "normal 1G2l\<C-V>jjlp"
+  call assert_equal(['xxxx', 'y∞xx', 'zzxx'], getline(1, 3))
+  bwipe!
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab