Preserve TUI input when terminal focus returns - #35649
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## Why Refreshing the terminal palette on a focus event can block the input loop and discard keystrokes entered while focus is returning. ## What changed - Keep the palette cached by the startup probe when handling `FocusGained`. - Continue updating focus state and requesting a redraw without issuing new foreground or background color queries. ## Testing - Verify a queued key is delivered after `FocusGained`. - Exercise focus regain in a pseudo-terminal with immediate and delayed input, and verify it emits no additional palette queries. GitOrigin-RevId: 16e26f81c1343d01f6d0baeff3f204bcc91dd6f3
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Preserve TUI input when terminal focus returns
Why
Refreshing the terminal palette on a focus event can block the input loop and
discard keystrokes entered while focus is returning.
What changed
FocusGained.foreground or background color queries.
Testing
FocusGained.and verify it emits no additional palette queries.