fix suggest bug when in selectionMode:never (microsoft#253887)

fix microsoft#253183

Author: meganrogge

src/vs/workbench/contrib/terminalContrib/suggest/browser/terminal.suggest.contribution.ts

@@ -427,7 +427,8 @@ registerActiveInstanceAction({
 	keybinding: [{
 		primary: KeyCode.Tab,
 		// Tab is bound to other workbench keybindings that this needs to beat
-		weight: KeybindingWeight.WorkbenchContrib + 2
+		weight: KeybindingWeight.WorkbenchContrib + 2,
+		when: ContextKeyExpr.and(SimpleSuggestContext.HasFocusedSuggestion)
 	},
 	{
 		primary: KeyCode.Enter,

src/vs/workbench/contrib/terminalContrib/suggest/browser/terminalSuggestAddon.ts

@@ -816,8 +816,9 @@ export class SuggestAddon extends Disposable implements ITerminalAddon, ISuggest
 		if (!suggestion) {
 			suggestion = this._suggestWidget?.getFocusedItem();
 		}
+
 		const initialPromptInputState = this._mostRecentPromptInputState;
-		if (!suggestion || !initialPromptInputState || this._leadingLineContent === undefined || !this._model) {
+		if (!suggestion?.item || !initialPromptInputState || this._leadingLineContent === undefined || !this._model) {
 			this._suggestTelemetry?.acceptCompletion(this._sessionId, undefined, this._mostRecentPromptInputState?.value);
 			return;
 		}