Use box-drawing characters for split separators

nvim/lua/darcula/options.lua

@@ -49,16 +49,16 @@ vim.opt.errorbells = false
 vim.opt.expandtab = true
 vim.opt.fileencoding = "UTF-8"
 vim.opt.fillchars = {
-  vert = " ",
+  vert = "│",
   eob = " ",
   stl = " ",
   stlnc = " ",
-  horiz = " ",
+  horiz = "─",
-  horizup = " ",
+  horizup = "┴",
-  horizdown = " ",
+  horizdown = "┬",
-  verthoriz = " ",
+  verthoriz = "┼",
-  vertleft = " ",
+  vertleft = "┤",
-  vertright = " "
+  vertright = "├"
 }
 vim.opt.foldcolumn = "0"
 vim.opt.guicursor =