fix(cat-voices): prevent reseting cursor position in rich text editor (#2590)

* fix: don't trim markdown

* chore: cleanup

* fix: prevent cursor reset

Author: dt-iohk

catalyst_voices/apps/voices/lib/common/codecs/markdown_codec.dart

@@ -14,11 +14,11 @@ import 'package:markdown_quill/markdown_quill.dart';
 // models/shared package
 const markdown = MarkdownCodec();
 
-final _mdDocument = md.Document();
-final _mdToDelta = MarkdownToDelta(markdownDocument: _mdDocument);
 final _deltaToMd = DeltaToMarkdown(
   customContentHandler: DeltaToMarkdown.escapeSpecialCharactersRelaxed,
 );
+final _mdDocument = md.Document();
+final _mdToDelta = MarkdownToDelta(markdownDocument: _mdDocument);
 
 final class MarkdownCodec extends Codec<MarkdownData, Delta> {
   const MarkdownCodec();

catalyst_voices/apps/voices/lib/widgets/document_builder/value/multiline_text_entry_markdown_widget.dart

@@ -70,9 +70,9 @@ class _MultilineTextEntryMarkdownWidgetState extends State<MultilineTextEntryMar
           ),
         VoicesRichText(
           controller: _controller,
-          enabled: widget.isEditMode,
           focusNode: _focus,
           scrollController: _scrollController,
+          enabled: widget.isEditMode,
           minHeight: 160,
           charsLimit: _maxLength,
           onChanged: _onChanged,
@@ -144,8 +144,10 @@ class _MultilineTextEntryMarkdownWidgetState extends State<MultilineTextEntryMar
     widget.onChanged([change]);
   }
 
-  void _onChanged(MarkdownData? markdownData) {
-    _onChangedDebouncer.run(() => _dispatchChange(markdownData));
+  void _onChanged(MarkdownData? _) {
+    // Get markdown data from the controller, the method argument might
+    // already not be what latest controller holds due to debouncer delay.
+    _onChangedDebouncer.run(() => _dispatchChange(_controller.markdownData));
   }
 
   void _toggleEditMode() {

catalyst_voices/apps/voices/lib/widgets/rich_text/voices_rich_text.dart

@@ -136,8 +136,16 @@ final class VoicesRichTextController extends quill.QuillController {
     } else if (newMarkdownData.data.isEmpty) {
       clear();
     } else {
+      // current selection
+      final currentSelection = selection;
+
+      // update document (resets selection)
       final delta = markdown.encoder.convert(newMarkdownData);
-      document = quill.Document.fromDelta(delta);
+      final newDocument = quill.Document.fromDelta(delta);
+      document = newDocument;
+
+      // revert selection
+      updateSelection(currentSelection, quill.ChangeSource.local);
     }
   }