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IME composition causes window flickering/shaking on Windows #3045
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area:input-keyboardKeyboard shortcuts, keybindings, copy/paste, clipboard, mouse, and text inputKeyboard shortcuts, keybindings, copy/paste, clipboard, mouse, and text inputarea:platform-windowsWindows-specific: PowerShell, cmd, Git Bash, WSL, Windows TerminalWindows-specific: PowerShell, cmd, Git Bash, WSL, Windows Terminalarea:terminal-renderingDisplay and rendering: flickering, scrolling, line wrapping, output formattingDisplay and rendering: flickering, scrolling, line wrapping, output formatting
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area:input-keyboardKeyboard shortcuts, keybindings, copy/paste, clipboard, mouse, and text inputKeyboard shortcuts, keybindings, copy/paste, clipboard, mouse, and text inputarea:platform-windowsWindows-specific: PowerShell, cmd, Git Bash, WSL, Windows TerminalWindows-specific: PowerShell, cmd, Git Bash, WSL, Windows Terminalarea:terminal-renderingDisplay and rendering: flickering, scrolling, line wrapping, output formattingDisplay and rendering: flickering, scrolling, line wrapping, output formatting
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Description
When typing CJK characters (Chinese/Japanese/Korean) using Windows IME in the Copilot CLI, the terminal window visibly flickers/shakes on each keystroke during IME composition.
Steps to Reproduce
Expected Behavior
The TUI should not re-render/redraw the entire frame during IME composition events. The input area should remain stable while the user is composing characters.
Actual Behavior
Every IME composition event triggers a full TUI re-render, causing visible window flickering that makes the CLI uncomfortable to use with CJK input methods.
Environment
Impact
This significantly degrades UX for CJK users and discourages use of the CLI in non-English languages.