patch 8.2.3684: blockwise insert does not handle autoindent properly

Problem:    Blockwise insert does not handle autoindent properly.
Solution:   Adjust text column for indent. (closes #9229)

src/ops.c

@@ -1627,6 +1627,10 @@ op_insert(oparg_T *oap, long count1)
 		    --bd2.textlen;
 	    }
 	    bd.textcol = bd2.textcol;
+	    if (did_indent && bd.textcol > ind_pre)
+		// If the insert was in the indent then include the indent
+		// change in the new text, otherwise don't.
+		bd.textcol += ind_post - ind_pre;
 	    bd.textlen = bd2.textlen;
 	}
 

src/testdir/test_blockedit.vim

@@ -14,6 +14,33 @@ func Test_blockinsert_indent()
   bwipe!
 endfunc
 
+func Test_blockinsert_autoindent()
+  new
+  let lines =<< trim END
+      var d = {
+      a: () => 0,
+      b: () => 0,
+      c: () => 0,
+      }
+  END
+  call setline(1, lines)
+  filetype plugin indent on
+  setlocal sw=2 et ft=vim
+  setlocal indentkeys+=:
+  exe "norm! 2Gf)\<c-v>2jA: asdf\<esc>"
+  let expected =<< trim END
+      var d = {
+        a: (): asdf => 0,
+      b: (): asdf => 0,
+      c: (): asdf => 0,
+      }
+  END
+  call assert_equal(expected, getline(1, 5))
+
+  filetype off
+  bwipe!
+endfunc
+
 func Test_blockinsert_delete()
   new
   let _bs = &bs

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3684,
 /**/
     3683,
 /**/