nvim: don't use = in filenames

dot_config/nvim/lua/configs/options.lua

@@ -45,6 +45,13 @@ function M.setup()
   vim.o.breakindentopt = 'shift:4'
   vim.o.showbreak = '…'
 
+  local isfname = {}
+  for _, ch in ipairs(vim.opt.isfname:get()) do
+    if ch ~= "=" then
+      table.insert(isfname, ch)
+    end
+  end
+  vim.opt.isfname = isfname
 
   local function set_winopts()
     vim.o.cursorline = true