Add regression tests for duplicate sidebar git publishes

cmuxTests/WorkspaceUnitTests.swift

@@ -6,6 +6,7 @@ import WebKit
 import ObjectiveC.runtime
 import Bonsplit
 import UserNotifications
+import Combine
 
 #if canImport(cmux_DEV)
 @testable import cmux_DEV
@@ -2111,6 +2112,85 @@ final class WorkspacePanelGitBranchTests: XCTestCase {
         XCTAssertEqual(ordered.map(\.isDirty), [false, true])
     }
 
+    func testUpdatingFocusedPanelGitBranchWithSameStateDoesNotRepublishWorkspace() {
+        let workspace = Workspace()
+        guard let panelId = workspace.focusedPanelId else {
+            XCTFail("Expected initial focused panel")
+            return
+        }
+
+        var publishCount = 0
+        let cancellable = workspace.objectWillChange.sink { _ in
+            publishCount += 1
+        }
+        defer { cancellable.cancel() }
+
+        workspace.updatePanelGitBranch(panelId: panelId, branch: "main", isDirty: false)
+        let baselinePublishCount = publishCount
+
+        XCTAssertGreaterThan(
+            baselinePublishCount,
+            0,
+            "Expected the first focused branch update to publish workspace changes"
+        )
+
+        workspace.updatePanelGitBranch(panelId: panelId, branch: "main", isDirty: false)
+
+        XCTAssertEqual(
+            publishCount,
+            baselinePublishCount,
+            "Expected identical focused branch refreshes to avoid extra workspace publishes"
+        )
+    }
+
+    func testUpdatingFocusedPanelPullRequestWithSameStateDoesNotRepublishWorkspace() {
+        let workspace = Workspace()
+        guard let panelId = workspace.focusedPanelId else {
+            XCTFail("Expected initial focused panel")
+            return
+        }
+
+        workspace.updatePanelGitBranch(panelId: panelId, branch: "feature/sidebar-pr", isDirty: false)
+
+        var publishCount = 0
+        let cancellable = workspace.objectWillChange.sink { _ in
+            publishCount += 1
+        }
+        defer { cancellable.cancel() }
+
+        let pullRequestURL = URL(string: "https://github.com/manaflow-ai/cmux/pull/2388")!
+        workspace.updatePanelPullRequest(
+            panelId: panelId,
+            number: 2388,
+            label: "PR",
+            url: pullRequestURL,
+            status: .open,
+            branch: "feature/sidebar-pr"
+        )
+        let baselinePublishCount = publishCount
+
+        XCTAssertGreaterThan(
+            baselinePublishCount,
+            0,
+            "Expected the first focused pull request update to publish workspace changes"
+        )
+
+        workspace.updatePanelPullRequest(
+            panelId: panelId,
+            number: 2388,
+            label: "PR",
+            url: pullRequestURL,
+            status: .open,
+            branch: "feature/sidebar-pr"
+        )
+
+        XCTAssertEqual(
+            publishCount,
+            baselinePublishCount,
+            "Expected identical focused pull request refreshes to avoid extra workspace publishes"
+        )
+    }
+
     @MainActor
     func testSidebarPullRequestsTrackFocusedPanelOnly() {
         let workspace = Workspace()