fix(jump): use nvim_win_set_cursor instead of vim.fn.cursor

neovim/neovim#27858 thankfully fixed the
relevant bug, but only for the API function.

Closes #70

README.md

@@ -270,7 +270,7 @@ require('leap.user').set_repeat_keys('<enter>', '<backspace>')
 <details>
 <summary>Workaround for the duplicate cursor bug when autojumping</summary>
 
-Until https://github.com/neovim/neovim/issues/20793 is fixed:
+For Neovim versions < 0.10 (https://github.com/neovim/neovim/issues/20793):
 
 ```lua
 -- Hide the (real) cursor when leaping, and restore it afterwards.
@@ -418,7 +418,7 @@ some editor options while the plugin is active (`:h leap-events`).
 <details>
 <summary>Workaround for the duplicate cursor bug when autojumping</summary>
 
-Until https://github.com/neovim/neovim/issues/20793 is fixed:
+For Neovim versions < 0.10 (https://github.com/neovim/neovim/issues/20793):
 
 ```lua
 -- Hide the (real) cursor when leaping, and restore it afterwards.

fnl/leap/highlight.fnl

@@ -54,6 +54,7 @@
                                {:priority self.priority.backdrop})))))
 
 
+; NOTE: Can be removed once minimal required nvim version is >= 0.10. (#70)
 (fn M.highlight-cursor [self]
   "The cursor is down on the command line during `getchar`,
 so we set a temporary highlight on it to see where we are."

fnl/leap/jump.fnl

@@ -67,14 +67,17 @@ the API), make the motion appear to behave as an inclusive one."
   (pcall api.nvim_exec_autocmds "CursorMoved" {:group "matchup_matchparen"}))
 
 
-(fn jump-to! [pos {: winid : add-to-jumplist? : mode
-                   : offset : backward? : inclusive-op?}]
+(fn jump-to! [[lnum col]
+              {: winid : add-to-jumplist? : mode : offset
+               : backward? : inclusive-op?}]
   (local op-mode? (mode:match :o))
   ; Note: <C-o> will ignore this if the line has not changed (neovim#9874).
   (when add-to-jumplist? (vim.cmd "norm! m`"))
   (when (not= winid (api.nvim_get_current_win))
     (api.nvim_set_current_win winid))
-  (vim.fn.cursor pos)
+
+  (api.nvim_win_set_cursor 0 [lnum (- col 1)])  ; (1,1) -> (1,0)
+
   (when offset (add-offset! offset))
   ; Since Vim interprets our jump as an exclusive motion (:h exclusive),
   ; we need custom tweaks to behave as an inclusive one. (This is only

fnl/leap/main.fnl

@@ -358,7 +358,8 @@ char separately.
          (when-not count
            (hl:apply-backdrop backward? ?target-windows))
          (do ,...)
-         (hl:highlight-cursor)
+         (when (= (vim.fn.has "nvim-0.10") 0)
+           (hl:highlight-cursor))
          (vim.cmd :redraw)))
 
   ; Helper functions ///