[Bug] When my language is plaintext, I enter the @ symbol without triggering provideCompletionItems

[chenkang-noob]

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

No response

Monaco Editor Playground Code

When I enter the @ symbol or non-letter, it does not trigger provideCompletionItems

Reproduction Steps

<title>Monaco Editor Example</title> <script src="https://unpkg.com/monaco-editor@latest/min/vs/loader.js"></script>

<script> require.config({ paths: { 'vs': 'https://unpkg.com/monaco-editor@latest/min/vs' }}); require(['vs/editor/editor.main'], function() { const editor = monaco.editor.create(document.getElementById('container'), { value: '', language: 'plaintext', theme: 'vs-dark' });

    monaco.languages.registerCompletionItemProvider('plaintext', {
        provideCompletionItems: (model, position) => {
            console.log("=====>")
            const lineContent = model.getLineContent(position.lineNumber);
            const textUntilPosition = lineContent.substring(0, position.column - 1);

            let suggestions = [];

            if (textUntilPosition.endsWith('@')) {
                suggestions = [
                    { label: 'user1', kind: monaco.languages.CompletionItemKind.User, insertText: 'user1' },
                    { label: 'user2', kind: monaco.languages.CompletionItemKind.User, insertText: 'user2' },
                    { label: 'team1', kind: monaco.languages.CompletionItemKind.Class, insertText: 'team1' }
                ];
            }

            return { suggestions: suggestions };
        }
    });
});

</script>

Actual (Problematic) Behavior

When I enter the @ symbol or a number, it does not trigger provideCompletionItems

Expected Behavior

Trigger suggestion

Additional Context

No response