API: nvim_win_set_cursor: set curswant neovim#8613

Fixes neovim#8591

src/nvim/api/window.c

@@ -93,6 +93,9 @@ void nvim_win_set_cursor(Window window, ArrayOf(Integer, 2) pos, Error *err)
   // When column is out of range silently correct it.
   check_cursor_col_win(win);
 
+  // Make sure we stick in this column.
+  win->w_curswant = (colnr_T)col;
+
   // make sure cursor is in visible range even if win != curwin
   update_topline_win(win);
 

test/functional/api/window_spec.lua

@@ -108,6 +108,29 @@ describe('api/win', function()
       neq(win, curwin())
     end)
 
+    it('remembers what column it wants to be in', function()
+      insert("first line")
+      feed('o<esc>')
+      insert("second line")
+
+      feed('gg')
+      wait() -- let nvim process the 'gg' command
+
+      -- cursor position is at beginning
+      local win = curwin()
+      eq({1, 0}, window('get_cursor', win))
+
+      -- move cursor to column 5
+      window('set_cursor', win, {1, 5})
+
+      -- move down a line
+      feed('j')
+      wait() -- let nvim process the 'j' command
+
+      -- cursor is still in column 5
+      eq({2, 5}, window('get_cursor', win))
+    end)
+
   end)
 
   describe('{get,set}_height', function()