Separate explorer checkout from panel state

packages/app/src/stores/explorer-checkout-context.ts

@@ -0,0 +1,23 @@
+export interface ExplorerCheckoutContext {
+  serverId: string;
+  cwd: string;
+  isGit: boolean;
+}
+
+let activeExplorerCheckout: ExplorerCheckoutContext | null = null;
+
+export function getActiveExplorerCheckout(): ExplorerCheckoutContext | null {
+  return activeExplorerCheckout;
+}
+
+export function setActiveExplorerCheckout(checkout: ExplorerCheckoutContext | null) {
+  if (
+    activeExplorerCheckout?.serverId === checkout?.serverId &&
+    activeExplorerCheckout?.cwd === checkout?.cwd &&
+    activeExplorerCheckout?.isGit === checkout?.isGit
+  ) {
+    return;
+  }
+
+  activeExplorerCheckout = checkout;
+}