Make copy_dotfiles POSIX, simplify zsh files, minor nvim changes

src_files/.config/nvim/lua/util_functions.lua

@@ -80,6 +80,7 @@ function ToggleWritingMode()
         vim.opt_local.relativenumber = true
         vim.opt_local.signcolumn = "yes"
         vim.opt_local.cursorline = true
+        vim.api.nvim_set_hl(0, 'SpellCap', vim.g.wrmode_prev_hl_spellcap or {})
         vim.opt_local.spell = false
         -- vim.opt_local.wrap = true -- TODO: needed?
         vim.opt_local.textwidth = 0
@@ -98,6 +99,8 @@ function ToggleWritingMode()
         local writing_pane = vim.api.nvim_get_current_win()
         EnableWritingModeUiForCurrentWindow()
         vim.opt_local.spell = true
+        vim.g.wrmode_prev_hl_spellcap = vim.api.nvim_get_hl(0, { name = 'SpellCap' })
+        vim.api.nvim_set_hl(0, 'SpellCap', {})
         vim.opt_local.textwidth = window_width
         vim.opt_local.scrolloff = 14
         vim.opt_local.formatoptions:append('t')