after refactor server attach another project which does not support workspaceFolder

[glepnir]

Description

tsserver does not support workspaceFolders, even the server does not support workspaceFolder it still return true.

nvim-lspconfig/lua/lspconfig/manager.lua

Lines 134 to 145 in 064221e

	reuse_client = function(existing_client)
	if (self._clients[root_dir] or {})[existing_client.name] then
	self:_notify_workspace_folder_added(root_dir, existing_client)
	return true
	end
	for _, dir_clients in pairs(self._clients) do
	if dir_clients[existing_client.name] then
	self:_notify_workspace_folder_added(root_dir, existing_client)
	return true
	end
	end

simply made _notify_workspace_folder_added return a boolean it will cause another prolem vsplit open two file which in two projects and mksession then nvim -S Session.vim print existing_client.initialized it will be nil when second buffer attached . that mean we can not get the
server_capabilities at that time reuse_client will return false. before use a timer to wait first server initialized then check it support workspacFolder or not . refactor mentioned add in new_config hook that doesn't make sense.

[jrop]

Is this the successor to #3456? I'm also having an issue where multiple vtsls servers attach to a buffer upon open.

From my investigation, the issue is repeated (programmatic) calls to vim.cmd.LspStart (by a plugin). Previously, they seemed to be idempotent, but now more LSPs are started with each call to :LspStart.

I ran a bisect:

There are only 'skip'ped commits left to test.
The first bad commit could be any of:
8d9fd3581ac07a2e1940435e13bda31a0cdeb795 (this commit does not run for me at all, it gives a long error)
2eccb418f2f972ad1167f8491a8180acdeb02384