fix: Add layout refresher callback to ChatInputTextViewer for dynamic height adjustments

[ethanyhou]

fix #215

[Copilot]

Pull request overview

This PR addresses issue #215 where recalling long chat input history could cause the chat input to grow without the containing chat view relayouting, hiding the bottom picker/action row. It does so by replacing a brittle fixed parent traversal in ChatInputTextViewer with an owner-provided relayout callback, and adds SWTBot coverage to validate picker visibility after history recall.

Changes:

• Add a layoutRefresher callback hook to ChatInputTextViewer and invoke it after height-hint updates.
• Wire the relayout callback from ActionBar to request a relayout of the chat view container when the input height changes, and tag the mode picker with a SWTBot widget id.
• Update SWTBot probe execution to support arrow key posting and add a new probe script reproducing the history-recall layout scenario.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/ChatInputTextViewer.java	Introduces a relayout callback to avoid fixed-depth parent layout calls when input height changes.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/ActionBar.java	Wires the new relayout callback and adds a SWTBot widget id for the mode picker.
com.microsoft.copilot.eclipse.swtbot.test/src/com/microsoft/copilot/eclipse/swtbot/test/probe/StepExecutor.java	Enhances probe key handling by posting SWT key events and adds direct StyledText focus/text support.
com.microsoft.copilot.eclipse.swtbot.test/probe-scripts/chat-input-history-layout-001.json	Adds an SWTBot probe to validate pickers remain visible after recalling a long input from history.

[jdneo]

Please create a new PR for the skill modification.

A UX regression in this PR, when input multiple lines, only single line is visible.

Expected:

Note there is no scroll bar in input box