feat(dap): add option evaluate_to_string_in_debug_views (#377)

README.md

@@ -219,6 +219,11 @@ require("flutter-tools").setup {
     -- if empty dap will not stop on any exceptions, otherwise it will stop on those specified
     -- see |:help dap.set_exception_breakpoints()| for more info
     exception_breakpoints = {}
+    -- Whether to call toString() on objects in debug views like hovers and the
+    -- variables list.
+    -- Invoking toString() has a performance cost and may introduce side-effects,
+    -- although users may expected this functionality. null is treated like false.
+    evaluate_to_string_in_debug_views = true,
     register_configurations = function(paths)
       require("dap").configurations.dart = {
         <put here config that you would find in .vscode/launch.json>

lua/flutter-tools/config.lua

@@ -82,6 +82,7 @@ local config = {
   debugger = {
     enabled = false,
     exception_breakpoints = nil,
+    evaluate_to_string_in_debug_views = true,
     register_configurations = function(paths)
       require("dap").configurations.dart = {
         {

lua/flutter-tools/runners/debugger_runner.lua

@@ -96,6 +96,9 @@ function DebuggerRunner:run(paths, args, cwd, on_run_data, on_run_exit)
         launch_config.args = vim.list_extend(launch_config.args or {}, args or {})
         launch_config.dartSdkPath = paths.dart_sdk
         launch_config.flutterSdkPath = paths.flutter_sdk
+        if config.debugger.evaluate_to_string_in_debug_views then
+          launch_config.evaluateToStringInDebugViews = true
+        end
         dap.run(launch_config)
       end
     )