fix: dirty detection — compare fullText, snapshot after load

Stefan reported false-positive "Discard unsaved changes?"
dialogs when clicking around in the file list. Cause: the
naive `_code.text == _loadedText` check fired stale even
right after _code.text = text, because CodeController
silently rewrites the visible text during the assignment
(trailing-newline normalisation, fold marker insertion on
some YAML constructs, …) so _code.text deviated from the
just-stored _loadedText immediately.

Fix:
  * Drop `_loadedText` field, replace with `_baseline`.
  * Set `_code.text = ...` first (outside setState), then
    capture `_baseline = _code.fullText` inside setState.
    fullText is the canonical post-processed value, not the
    visible-after-folding text — comparing fullText against
    fullText eliminates the spurious diff.
  * _dirty getter now compares `_code.fullText != _baseline`.

Applied to all four load / save / new-flow sites.

Bump version 0.1.0 → 0.1.1. Studio's pubspec already pins
`ref: main` so the next `flutter pub get` picks the fix up.

Signed-off-by: flemming-it <sf@flemming.it>

lib/src/flow_editor_page.dart

@@ -52,7 +52,14 @@ class _FlowEditorPageState extends State<FlowEditorPage> {
   late final CodeController _code;
   late final FlowEditorStrings _l;
   String? _activeName;
-  String _loadedText = '';
+  // Baseline captured AFTER the CodeController has finished
+  // processing the loaded text (line-ending normalisation,
+  // trailing-newline handling, fold-marker insertion, …).
+  // Comparing _code.fullText against this baseline avoids the
+  // false-positive "discard unsaved changes?" prompts the
+  // naive _code.text == _loadedText check used to trigger on
+  // files the controller silently rewrote during load.
+  String _baseline = '';
   late Future<List<_FlowFile>> _files;
   Object? _runError;
   Map<String, Object>? _runOutputs;
@@ -85,7 +92,7 @@ class _FlowEditorPageState extends State<FlowEditorPage> {
     if (mounted) setState(() {});
   }
 
-  bool get _dirty => _activeName != null && _code.text != _loadedText;
+  bool get _dirty => _activeName != null && _code.fullText != _baseline;
 
   Future<List<_FlowFile>> _listFiles() async {
     final dir = Directory(_defaultFlowsDir());
@@ -115,10 +122,15 @@ class _FlowEditorPageState extends State<FlowEditorPage> {
     if (!f.existsSync()) return;
     final text = await f.readAsString();
     if (!mounted) return;
+    // Set the controller text first, then snapshot fullText
+    // as the baseline. Reading fullText after the assignment
+    // captures whatever line-ending normalisation / fold-
+    // marker insertion CodeController applied, so the dirty
+    // check is comparing apples to apples.
+    _code.text = text;
     setState(() {
       _activeName = name;
-      _loadedText = text;
+      _baseline = _code.fullText;
-      _code.text = text;
       _runOutputs = null;
       _runError = null;
     });
@@ -130,10 +142,10 @@ class _FlowEditorPageState extends State<FlowEditorPage> {
       if (keep == false || !mounted) return;
     }
     final text = await File(f.path).readAsString();
+    _code.text = text;
     setState(() {
       _activeName = f.name;
-      _loadedText = text;
+      _baseline = _code.fullText;
-      _code.text = text;
       _runOutputs = null;
       _runError = null;
     });
@@ -168,7 +180,7 @@ class _FlowEditorPageState extends State<FlowEditorPage> {
       await f.writeAsString(_code.text, flush: true);
       if (!mounted) return;
       setState(() {
-        _loadedText = _code.text;
+        _baseline = _code.fullText;
         _files = _listFiles();
       });
     } catch (e) {
@@ -215,10 +227,10 @@ outputs:
       }
       await f.writeAsString(template, flush: true);
       if (!mounted) return;
+      _code.text = template;
       setState(() {
         _activeName = name;
-        _loadedText = template;
+        _baseline = _code.fullText;
-        _code.text = template;
         _files = _listFiles();
       });
     } catch (e) {

pubspec.yaml

@@ -1,6 +1,6 @@
 name: fai_studio_flow_editor
 description: Swappable inline YAML editor for F∆I Studio flows.
-version: 0.1.0
+version: 0.1.1
 publish_to: 'none'
 repository: https://git.flemming.ai/fai/studio-flow-editor