added floating error window

init.lua

@@ -439,6 +439,27 @@ require('lazy').setup(
 
                 vim.keymap.set("n", "<leader>ca", vim.lsp.buf.code_action, { desc = "Perform code action" })
                 vim.keymap.set("n", "<leader>rn", vim.lsp.buf.rename, { desc = "Rename token under cursor" })
+
+                function OpenDiagnosticIfNoFloat()
+                    for _, winid in pairs(vim.api.nvim_tabpage_list_wins(0)) do
+                        if vim.api.nvim_win_get_config(winid).zindex then
+                            return
+                        end
+                    end
+                    -- THIS IS FOR BUILTIN LSP
+                    vim.diagnostic.open_float{
+                        scope = "cursor",
+                        focusable = false,
+                        close_events = {
+                            "CursorMoved",
+                            "CursorMovedI",
+                            "BufHidden",
+                            "InsertCharPre",
+                            "WinLeave",
+                        },
+                    }
+                end
+                vim.keymap.set("n", "<leader>oe", OpenDiagnosticIfNoFloat, { desc = "Show full error in floating window" })
             end,
         },
         { 'dcampos/nvim-snippy',