Add test for for bug in Neovim 0.10

The test gets skipped for now because we know it to be broken.  It need
to be enabled when the bug gets fixed.

.busted

@@ -26,7 +26,8 @@
 return {
 	_all = {
 		coverage = false,
-		lua = './test/nvim-shim'
+		lua = './test/nvim-shim',
+		['exclude-tags'] = {'skip'},
 	},
 	default = {
 		verbose = true,

test/e2e/strategy/global.lua

@@ -103,4 +103,24 @@ return foo]]
 		assert.nvim(nvim).has_extmarks_at(2, 11, 'lua')
 		assert.nvim(nvim).has_extmarks_at(3, 11, 'lua')
 	end)
+
+	it('Preserves nested highlighting when entering insert mode #skip', function()
+		-- This is broken on Neovim 0.10+, so we skip it for the time being.
+		-- See https://github.com/HiPhish/rainbow-delimiters.nvim/pull/121
+
+		local content = [[local tmp = {
+	[1] = { 1 },
+	[2] = {
+		a = print(),
+	},
+}]]
+		nvim:buf_set_lines(0, 0, -1, true, vim.fn.split(content, '\n'))
+		nvim:buf_set_option(0, 'filetype', 'lua')
+		-- Make a change inside the parentheses
+		nvim:win_set_cursor(0, {4, 11})
+		nvim:feedkeys(rtc'a <esc>', '', false)
+
+		local hl_group = require('rainbow-delimiters.config').highlight[3]
+		assert.nvim(nvim).has_extmarks_at(3, 11, 'lua', hl_group)
+	end)
 end)