fix(previewer): improve binary mime type check (#3083)

* fix(previewer): improve binary mime type check

Problem: mime type for a ts/js file can either return `text/plain` or
`application/javascript` based on the contents of the file.
Previously, this meant `application/javascript` would be considered
"possibly binary". This, in conjunction with how `vim.filetype.match`
does not give a result for a filename that ends in `.ts`, would lead to
a typescript file taking the path of `check_mime_type` and eventually
`mime_hook`.

Solution: Include `application/javascript` as a non-binary file type
during mime type check.

* [docgen] Update doc/telescope.txt
skip-checks: true

---------

Co-authored-by: Github Actions <actions@github>

doc/telescope.txt

@@ -325,7 +325,14 @@ telescope.setup({opts})                                    *telescope.setup()*
         path_display can also be set to 'hidden' string to hide file names
 
         path_display can also be set to a function for custom formatting of
-        the path display. Example:
+        the path display with the following signature
+
+        Signature: fun(opts: table, path: string): string, table?
+
+        The optional table is an list of positions and highlight groups to
+        set the highlighting of the return path string.
+
+        Example:
 
             -- Format path as "file.txt (path\to\file\)"
             path_display = function(opts, path)
@@ -333,6 +340,24 @@ telescope.setup({opts})                                    *telescope.setup()*
               return string.format("%s (%s)", tail, path)
             end,
 
+            -- Format path and add custom highlighting
+            path_display = function(opts, path)
+              local tail = require("telescope.utils").path_tail(path)
+              path = string.format("%s (%s)", tail, path)
+
+              local highlights = {
+                {
+                  {
+                    0, -- highlight start position
+                    #path, -- highlight end position
+                  },
+                  "Comment", -- highlight group name
+                },
+              }
+
+              return path, highlights
+            end
+
         Default: {}
 
                                            *telescope.defaults.borderchars*