Inline chat: select prefilled input for a fast override (microsoft#196313)

Author: aeschli

src/vs/workbench/contrib/inlineChat/browser/inlineChatController.ts

@@ -362,6 +362,9 @@ export class InlineChatController implements IEditorContribution {
 		this._zone.value.widget.updateInfo(this._activeSession.session.message ?? localize('welcome.1', "AI-generated code may be incorrect"));
 		this._zone.value.widget.preferredExpansionState = this._activeSession.lastExpansionState;
 		this._zone.value.widget.value = this._activeSession.session.input ?? this._activeSession.lastInput?.value ?? this._zone.value.widget.value;
+		if (this._activeSession.session.input) {
+			this._zone.value.widget.selectAll();
+		}
 
 		this._showWidget(true, options.position);