fix: wrong buffer encoding breaks accepting suggestions zbirenbaum#336

Author: imkerberos

lua/copilot/suggestion.lua

@@ -486,7 +486,9 @@ function mod.accept(modifier)
   -- Hack for 'autoindent', makes the indent persist. Check `:help 'autoindent'`.
   vim.schedule_wrap(function()
     vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes("<Space><Left><Del>", true, false, true), "n", false)
-    vim.lsp.util.apply_text_edits({ { range = range, newText = newText } }, vim.api.nvim_get_current_buf(), "utf-16")
+    local bufnr = vim.api.nvim_get_current_buf()
+    local encoding = vim.api.nvim_get_option_value('fileencoding', { buf = bufnr })
+    vim.lsp.util.apply_text_edits({ { range = range, newText = newText } }, bufnr, encoding)
     -- Put cursor at the end of current line.
     local cursor_keys = "<End>"
     if has_nvim_0_10_x then