feat: Winhl options for outline and preview windows

lua/symbols-outline/ui.lua

@@ -10,7 +10,7 @@ function M.add_hover_highlight(bufnr, line, col_start)
   vim.api.nvim_buf_add_highlight(
     bufnr,
     M.hovered_hl_ns,
-    'FocusedSymbol',
+    'SymbolsOutlineCurrent',
     line,
     col_start,
     -1
@@ -18,15 +18,15 @@ function M.add_hover_highlight(bufnr, line, col_start)
 end
 
 function M.setup_highlights()
-  -- Setup the FocusedSymbol highlight group if it hasn't been done already by
+  -- Setup the SymbolsOutlineCurrent highlight group if it hasn't been done already by
   -- a theme or manually set
-  if vim.fn.hlexists 'FocusedSymbol' == 0 then
+  if vim.fn.hlexists 'SymbolsOutlineCurrent' == 0 then
     local cline_hl = vim.api.nvim_get_hl_by_name('CursorLine', true)
     local string_hl = vim.api.nvim_get_hl_by_name('String', true)
 
     vim.api.nvim_set_hl(
       0,
-      'FocusedSymbol',
+      'SymbolsOutlineCurrent',
       { bg = cline_hl.background, fg = string_hl.foreground }
     )
   end