fix(vim): Fix config.toml path in readme. Fix replace range rendering. (#617)

* fix(vim): replace range rendering.

* fix(vim): fix config.toml path in readme.

clients/vim/README.md

@@ -116,7 +116,7 @@ In insert mode, Tabby plugin will show inline completion automatically when you
 
 You need to start the Tabby server before using the plugin. For Tabby server installation, please refer to this [documentation](https://tabby.tabbyml.com/docs/installation/).
 
-If your Tabby server endpoint is different from the default `http://localhost:8080`, please set the endpoint in `~/.tabby-client/config.toml`.
+If your Tabby server endpoint is different from the default `http://localhost:8080`, please set the endpoint in `~/.tabby-client/agent/config.toml`.
 
 ```toml
 # Server

clients/vim/autoload/tabby/virtual_text.vim

@@ -93,7 +93,7 @@ function! tabby#virtual_text#Render(request, choice)
   elseif suffix_replace_chars == 1
     let replace_char = strcharpart(current_line_suffix, 0, 1)
     let inlay = ''
-    if stridx(text_lines[0], replace_char) != 0
+    if strchars(text_lines[0]) > 0 && stridx(text_lines[0], replace_char) != 0
       let inlay = split(text_lines[0], replace_char)[0]
     endif
     call s:AddInlay(inlay, col('.'))
@@ -102,7 +102,7 @@ function! tabby#virtual_text#Render(request, choice)
       call s:AddInlay(inlay_suffix, col('.') + len(replace_char))
     endif
     if len(text_lines) > 1
-      if strchars(current_line_suffix) > 1
+      if strchars(current_line_suffix) > 0
         let range_start = col('.')
         if inlay != text_lines[0]
           let range_start += len(replace_char)