Desktop app freezes with 100% CPU when typing with Microsoft Pinyin IME #36607

Description

When typing Chinese characters using Microsoft Pinyin IME (ChsIME.exe) in the OpenCode desktop app, all CPU logical processors immediately spike to 100%, the input method and the app UI freeze, and after typing for a while the app becomes completely unresponsive.

Environment:

OpenCode version:

main.log
renderer.log

OS: Windows (ConsoleHost)
CPU: 12th Gen Intel Core i5-12600KF (10 cores, 16 logical processors)
IME: Microsoft Pinyin IME (ChsIME.exe)

Plugins

none

OpenCode version

1.17.18 (Electron 42.3.3)

Steps to reproduce

Steps to reproduce:

Launch OpenCode desktop app
Switch to Microsoft Pinyin IME
Start typing Chinese characters - CPU immediately maxes out and the UI freezes
Logs: The renderer log is flooded with repeated errors:

ResizeObserver loop completed with unsent notifications.
(See renderer.log in %APPDATA%\ai.opencode.desktop\logs<latest>)

Attempted workarounds (none resolved the issue):

--disable-gpu
--disable-direct-composition --disable-accelerated-2d-canvas
Clearing GPU cache, DawnGraphiteCache, DawnWebGPUCache directories
Additional notes:

The CLI version of OpenCode does not have this problem
This appears to be a Chromium/Electron compositor issue triggered by the IME candidate window causing a ResizeObserver feedback loop

Screenshot and/or share link

N/A - unable to screenshot while app is frozen

Operating System

Windows 10 Pro for Workstations 22H2 x64 (19045.6332)

Terminal

N/A - using the OpenCode desktop app, not a terminal emulator