fix(dap): attach debugger on windows (#381)

* fix: do not register configurations twice

Configurations are registered in debug runner run method

* fix: gracefully handle missing configurations

* fix: attach debugger on windows

Config changed according documentation in https://github.com/mfussenegger/nvim-dap/wiki/Debug-Adapter-installation#dart, fixes #274

lua/flutter-tools/dap.lua

@@ -1,4 +1,6 @@
-local ui = require("flutter-tools.ui")
+local lazy = require("flutter-tools.lazy")
+local path = lazy.require("flutter-tools.utils.path") ---@module "flutter-tools.utils.path"
+local ui = lazy.require("flutter-tools.ui") ---@module "flutter-tools.ui"
 
 local success, dap = pcall(require, "dap")
 if not success then
@@ -29,7 +31,13 @@ function M.setup(config)
         command = paths.flutter_bin,
         args = { "debug-adapter" },
       }
-      opts.register_configurations(paths)
+      if path.is_windows then
+        -- https://github.com/mfussenegger/nvim-dap/wiki/Debug-Adapter-installation#dart
+        -- add this if on windows, otherwise server won't open successfully
+        dap.adapters.dart.options = {
+          detached = false,
+        }
+      end
       local repl = require("dap.repl")
       repl.commands = vim.tbl_extend("force", repl.commands, {
         custom_commands = {

lua/flutter-tools/runners/debugger_runner.lua

@@ -72,6 +72,10 @@ function DebuggerRunner:run(paths, args, cwd, on_run_data, on_run_exit)
   local launch_configuration_count = 0
   config.debugger.register_configurations(paths)
   local all_configurations = require("dap").configurations.dart
+  if not all_configurations then
+    ui.notify("No launch configuration for DAP found", ui.ERROR)
+    return
+  end
   for _, c in ipairs(all_configurations) do
     if c.request == "launch" then
       table.insert(launch_configurations, c)