OpenSumi 3.3.0 Release: Multi‑line Completion, Intelligent Rewrite, and New Features

OpenSumi is an open‑source, high‑performance, and highly customizable IDE development framework that enables developers to build dual‑target (Web and Electron) integrated development environments.

Its goal is to make IDE customization simple and smooth.

Key improvements in version 3.3.0 include expanded code‑completion capabilities: multi‑line inline suggestions and an intelligent rewrite widget. Inline diff now supports cross‑file undo/redo and visual enhancements, improving the interaction experience with large language models.

Multi‑line Completion and Intelligent Rewrite

Multi‑line completion extends the original completion by allowing several suggestions to be applied simultaneously within the current cursor range.

Intelligent rewrite is a UI presentation of multi‑line completion when the suggested code differs significantly from the existing code.

How to Integrate

Implement a registerIntelligentCompletionProvider via the IIntelligentCompletionsRegistry . Example:

registerIntelligentCompletionFeature(registry: IIntelligentCompletionsRegistry): void {
  registry.registerIntelligentCompletionProvider(async (editor, position, token) => {
    return {
      items: [
        {
          content: 'completion value',
          range: {
            startLineNumber: position.lineNumber,
            startColumn: 1,
            endLineNumber: position.lineNumber + 3,
            endColumn: model?.getLineMaxColumn(position.lineNumber + 3),
          },
        },
      ],
      enableMultiLine: true,
    };
  });
}

Enable enableMultiLine and provide the range to activate the feature.

Support for Multi‑line Comments

The comment API now supports multi‑line comment display, allowing developers to implement custom multi‑line comment functionality.

Feature Highlights

Register tabbar right component

Adjust editor tabbar height

Configure inline diff style

Add “clear result” button to search panel

Chat slash command shortcut support

Accessibility enhancements for icons and AI‑native features

Support multi‑line inline completion

Register external extension API

Multi‑line edit rewrite widget

Configure extension host spawn options

Inline‑diff data calculation adjustments

Layout thrashing avoidance

Bug Fixes

Tab scrollbar style issues

Scrollbar component style updates

Editor tabbar style fixes

Bottom tab panel visibility

RJSF version inconsistency

Web worker capturer bug

Inline input overflow handling

Inline chat position calculation

Electron reload issue

Keyboard focus and accessibility for editor tabs

Right panel resize handles

Inline chat indentation

Document status synchronization

Model memory leak

Previewer listener updates

Tab list scope handling

Event‑driven state management

Other Improvements

Inline diff previewer snapshot refactor

Editor tabbar scroll optimization

Dependency organization refactor

Thanks to the community contributors for their work on OpenSumi.