Center tab labels and unify dock cursor resolution

new_editor/app/Application.cpp

@@ -482,6 +482,7 @@ void Application::RenderFrame() {
         }
         ApplyHostCaptureRequests(m_shellFrame.result);
         UpdateLastStatus(m_shellFrame.result);
+        ApplyCurrentCursor();
         AppendUIEditorShellInteraction(
             drawList,
             m_shellFrame,
@@ -520,6 +521,29 @@ float Application::PixelsToDips(float pixels) const {
     return dpiScale > 0.0f ? pixels / dpiScale : pixels;
 }
 
+LPCWSTR Application::ResolveCurrentCursorResource() const {
+    switch (Widgets::ResolveUIEditorDockHostCursorKind(
+        m_shellFrame.workspaceInteractionFrame.dockHostFrame.layout)) {
+    case Widgets::UIEditorDockHostCursorKind::ResizeEW:
+        return IDC_SIZEWE;
+    case Widgets::UIEditorDockHostCursorKind::ResizeNS:
+        return IDC_SIZENS;
+    case Widgets::UIEditorDockHostCursorKind::Arrow:
+    default:
+        return IDC_ARROW;
+    }
+}
+
+bool Application::ApplyCurrentCursor() const {
+    const HCURSOR cursor = LoadCursorW(nullptr, ResolveCurrentCursorResource());
+    if (cursor == nullptr) {
+        return false;
+    }
+
+    SetCursor(cursor);
+    return true;
+}
+
 UIPoint Application::ConvertClientPixelsToDips(LONG x, LONG y) const {
     return UIPoint(
         PixelsToDips(static_cast<float>(x)),
@@ -877,6 +901,13 @@ LRESULT CALLBACK Application::WndProc(HWND hwnd, UINT message, WPARAM wParam, LP
 
     Application* application = GetApplicationFromWindow(hwnd);
     switch (message) {
+    case WM_SETCURSOR:
+        if (application != nullptr &&
+            LOWORD(lParam) == HTCLIENT &&
+            application->ApplyCurrentCursor()) {
+            return TRUE;
+        }
+        break;
     case WM_DPICHANGED:
         if (application != nullptr && lParam != 0) {
             application->OnDpiChanged(