nvim: schedule setting 'clipboard' after UIEnter

Without scheduling, the startup time in WSL is slowed down by over
a second!

config/nvim/lua/fschauen/options.lua

@@ -19,12 +19,16 @@ M.setup = function()
   -- General
   o.belloff     = "all"           -- never ring bells
   o.hidden      = true            -- hide abandoned buffers
-  o.clipboard   = "unnamedplus"   -- synchronize with system clipboard
   o.lazyredraw  = true            -- don"t redraw screen during macros
   o.modelines   = 0               -- never use modelines
   o.fileformats = "unix,mac,dos"  -- prioritize unix <EOL> format
   o.winblend    = 8               -- minimum transparency for floating windows
 
+  -- Schedule the setting after `UiEnter` because it can increase startup-time.
+  vim.schedule(function()
+    o.clipboard = "unnamedplus"   -- synchronize with system clipboard
+  end)
+
   o.swapfile    = false           -- don"t use swap files
   o.writebackup = true            -- Make a backup before writing a file...
   o.backup      = false           -- ...but don"t keep it around.

config/nvim/spell/en.utf-8.add

@@ -94,3 +94,4 @@ VnTCC
 VSC
 VTCC
 ε
+rebase