fix: set a buffer variable for lsp floating window(#223)

Author: haorenW1025

lua/completion/hover.lua

@@ -219,6 +219,8 @@ local fancy_floating_markdown = function(contents, opts)
     winnr = api.nvim_open_win(bufnr, false, opt)
   end
   vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, stripped)
+  -- setup a variable for floating window, fix #223
+  vim.api.nvim_buf_set_var(bufnr, "lsp_floating", true)
 
   local cwin = vim.api.nvim_get_current_win()
   vim.api.nvim_set_current_win(winnr)

lua/completion/signature_help.lua

@@ -42,11 +42,13 @@ M.autoOpenSignatureHelp = function()
       if vim.tbl_isempty(lines) then
         return
       end
-      vim.lsp.util.focusable_preview(method, function()
+      local bufnr, _ = vim.lsp.util.focusable_preview(method, function()
         -- TODO show popup when signatures is empty?
         lines = vim.lsp.util.trim_empty_lines(lines)
         return lines, vim.lsp.util.try_trim_markdown_code_blocks(lines)
       end)
+      -- setup a variable for floating window, fix #223
+      vim.api.nvim_buf_set_var(bufnr, "lsp_floating", true)
     end)
   end
 end