Fix issue with start screen overwriting :checkhealth in neovim-qt

Now only shows on the first buffer of a new vim instance

lua/module/start.lua

@@ -1,9 +1,5 @@
 local M = require('module'):new()
 
--- TODO: When enabled, and when in neovim-qt, this seems to overwrite :checkhealth.
--- Maybe track if it's been triggered _at all_ this session, and if so don't trigger
--- again.
-
 function M:boot()
 	self.opts = {
 		win = {
@@ -17,6 +13,8 @@ function M:boot()
 	}
 	self.is_gui = false
 	self.is_visible = false
+	self.target_win = nil
+	self.target_buf = nil
 end
 
 function M:run()
@@ -29,6 +27,13 @@ function M:gui()
 	local win = vim.api.nvim_get_current_win()
 	local buf = vim.api.nvim_get_current_buf()
 
+	if (self.target_win == nil and self.target_buf == nil) then
+		self.target_win = win
+		self.target_buf = buf
+	elseif (self.target_win ~= win or self.target_buf ~= buf) then
+		return
+	end
+
 	self.is_gui = true
 	self.opts.win.list = vim.api.nvim_win_get_option(win, 'list')
 
@@ -58,6 +63,14 @@ function M:show()
 	local win = vim.api.nvim_get_current_win()
 	local buf = vim.api.nvim_create_buf(true, true)
 
+	if (self.target_win == nil and self.target_buf == nil) then
+		self.target_win = win
+		self.target_buf = buf
+	elseif (self.target_win ~= win or self.target_buf ~= buf) then
+		return
+	end
+
+
 	self:draw(buf)
 
 	vim.api.nvim_buf_set_option(buf, "modified", false)