fix SequenceEditor to clear existing diagnostics when switching between languages

Author: duranb

e2e-tests/data/sequence-adaptation-minimal.js

@@ -17,14 +17,14 @@
 const minimalInputLanguage = {
   fileExtension: '.txt',
   name: 'Minimal Test Language',
-  extension: [],
+  getEditorExtension: () => {},
 };
 
 // Minimal output language
 const minimalOutputLanguage = {
   fileExtension: '.json',
   name: 'JSON Output',
-  extension: [],
+  getEditorExtension: () => {},
 
   // Convert output back to input format
   toInputFormat: function (output) {
@@ -37,7 +37,7 @@ const minimalOutputLanguage = {
   },
 
   // Convert input to output format
-  toOutputFormat: function (input, context, name) {
+  toOutputFormat: function (input, _context, name) {
     // Uncomment the line below to test runtime errors:
     // throw new Error('Intentional adaptation error for testing');
 

src/components/sequencing/SequenceEditor.svelte

@@ -3,7 +3,7 @@
 <script lang="ts">
   import { standardKeymap } from '@codemirror/commands';
   import { syntaxTree } from '@codemirror/language';
-  import { lintGutter, openLintPanel } from '@codemirror/lint';
+  import { lintGutter, openLintPanel, setDiagnostics } from '@codemirror/lint';
   import { Compartment, EditorSelection, EditorState, Transaction, type Extension } from '@codemirror/state';
   import { keymap, type ViewUpdate } from '@codemirror/view';
   import type { SyntaxNode } from '@lezer/common';
@@ -149,6 +149,8 @@
       editorSequenceView.dispatch({
         effects: [compartmentAdaptation.reconfigure(inputEditorExtension)],
       });
+      // Clear any stale diagnostics
+      editorSequenceView.dispatch(setDiagnostics(editorSequenceView.state, []));
     }
   }