## Context Fixes a bug on Windows where the Alt modifier key becomes stuck in the pressed state after using Alt-Tab to switch away from and back to the Zed application. ### Root Cause In `crates/gpui_windows/src/events.rs`, when the window loses focus during Alt-Tab, the WM_KEYUP event for the Alt key is never delivered to the application. The pending modifier state in GPUI remains as `alt=true`. When the window regains focus, there is no synchronization point to reset this stale state. ## How to Review In `handle_activate_msg()` (WM_ACTIVATE handler), when the window is activated: 1. Reset the cached modifier tracking state (`last_reported_modifiers` and `last_reported_capslock` set to `None`) 2. Query the actual current modifier state from Windows using `GetKeyState()` APIs 3. Dispatch a `ModifiersChanged` event with the true state to synchronize GPUI ## Self-Review Checklist <!-- Check before requesting review: --> - [x] I've reviewed my own diff for quality, security, and reliability - [x] Unsafe blocks (if any) have justifying comments - [x] The content is consistent with the [UI/UX checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) - [ ] Tests cover the new/changed behavior - [x] Performance impact has been considered and is acceptable I think it's difficult to add tests for this because it's platform-dependent, but I recorded a video for comparison — sorry I only have an anime‑style app to show the key presses. <details> <summary>Video</summary> https://github.com/user-attachments/assets/b545178c-b360-4e2b-8d60-d6f95a0b4b79 https://github.com/user-attachments/assets/bc4d41eb-6f42-4040-a588-0fc46c576db7 </details> Closes #45485 Release Notes: - Fixed Alt modifier key stuck after Alt-Tab on Windows. Modifier state is now synchronized when the window regains focus, ensuring correct key interpretation after window switching. |
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Zed
Welcome to Zed, a high-performance, multiplayer code editor from the creators of Atom and Tree-sitter.
Installation
On macOS, Linux, and Windows you can download Zed directly or install Zed via your local package manager (macOS/Linux/Windows).
Other platforms are not yet available:
- Web (tracking issue)
Developing Zed
Contributing
See CONTRIBUTING.md for ways you can contribute to Zed.
Also... we're hiring! Check out our jobs page for open roles.
Licensing
License information for third party dependencies must be correctly provided for CI to pass.
We use cargo-about to automatically comply with open source licenses. If CI is failing, check the following:
- Is it showing a
no license specifiederror for a crate you've created? If so, addpublish = falseunder[package]in your crate's Cargo.toml. - Is the error
failed to satisfy license requirementsfor a dependency? If so, first determine what license the project has and whether this system is sufficient to comply with this license's requirements. If you're unsure, ask a lawyer. Once you've verified that this system is acceptable add the license's SPDX identifier to theacceptedarray inscript/licenses/zed-licenses.toml. - Is
cargo-aboutunable to find the license for a dependency? If so, add a clarification field at the end ofscript/licenses/zed-licenses.toml, as specified in the cargo-about book.
Sponsorship
Zed is developed by Zed Industries, Inc., a for-profit company.
If you’d like to financially support the project, you can do so via GitHub Sponsors. Sponsorships go directly to Zed Industries and are used as general company revenue. There are no perks or entitlements associated with sponsorship.