feat(terminal): add Kill Other Terminals command

Adds a new `workbench.action.terminal.killOthers` command that kills all
terminals except the currently active one, mirroring the existing
"Close Others" action available in the editor tab context menu.

Fixes microsoft#295740

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yogeshwaran-c

src/vs/workbench/contrib/terminal/browser/terminalActions.ts

@@ -1302,6 +1302,25 @@ export function registerTerminalActions() {
 		}
 	});
 
+	registerTerminalAction({
+		id: TerminalCommandId.KillOthers,
+		title: localize2('workbench.action.terminal.killOthers', 'Kill Other Terminals'),
+		precondition: ContextKeyExpr.or(sharedWhenClause.terminalAvailable, TerminalContextKeys.isOpen),
+		run: async (c) => {
+			const activeInstance = c.service.activeInstance;
+			if (!activeInstance) {
+				return;
+			}
+			const disposePromises: Promise<void>[] = [];
+			for (const instance of c.service.instances) {
+				if (instance !== activeInstance) {
+					disposePromises.push(c.service.safeDisposeTerminal(instance));
+				}
+			}
+			await Promise.all(disposePromises);
+		}
+	});
+
 	registerTerminalAction({
 		id: TerminalCommandId.KillEditor,
 		title: localize2('workbench.action.terminal.killEditor', 'Kill the Active Terminal in Editor Area'),

src/vs/workbench/contrib/terminal/common/terminal.ts

@@ -408,6 +408,7 @@ export const enum TerminalCommandId {
 	KillEditor = 'workbench.action.terminal.killEditor',
 	KillActiveTab = 'workbench.action.terminal.killActiveTab',
 	KillAll = 'workbench.action.terminal.killAll',
+	KillOthers = 'workbench.action.terminal.killOthers',
 	QuickKill = 'workbench.action.terminal.quickKill',
 	ConfigureTerminalSettings = 'workbench.action.terminal.openSettings',
 	ShellIntegrationLearnMore = 'workbench.action.terminal.learnMore',