[fix] preserve remote cursors when macOS hides the pointer, refs #116

apps/desktop/src/gui/runtime/cursor_presentation.h

@@ -33,6 +33,15 @@ class CursorPresentation {
     const bool separate =
         state.render_mode == CursorRenderMode::separate ||
         (state.render_mode == CursorRenderMode::legacy && state.visible);
+    system_hidden_ = state.render_mode == CursorRenderMode::hidden &&
+                     state.hidden_reason == CursorHiddenReason::system_hidden;
+    if (separate) {
+      mac_locator_allowed_ = state.shape != RemoteCursorShape::none;
+    } else if (!system_hidden_) {
+      // Embedded cursors and other hiding policies end the separate-cursor
+      // history. A later system_hidden sample must not revive that overlay.
+      mac_locator_allowed_ = false;
+    }
     // Old senders cannot distinguish embedded from hidden. Only explicit
     // metadata from a new sender can establish the no-device compatibility
     // case.
@@ -47,9 +56,21 @@ class CursorPresentation {
 
   void NoteInput(uint64_t now) { last_input_ = now; }
 
-  RemoteCursorShape Resolve(uint64_t now) {
+  RemoteCursorShape Resolve(uint64_t now, HostPlatform remote_platform) {
     if (!stale_at_) return RemoteCursorShape::default_cursor;
 
+    // macOS can keep its system cursor hidden after typing even while remote
+    // mouse events move it. Keep a previously separate desktop locator across
+    // those heartbeats; the video has no pointer to fall back to. On a new
+    // connection, use an arrow until the first visible shape arrives. The
+    // protocol cannot distinguish typing from other system_hidden cases;
+    // restrict this policy to identified Mac hosts and stop on any explicit
+    // embedded cursor or other hiding policy.
+    if (remote_platform == HostPlatform::MacOS && system_hidden_ &&
+        mac_locator_allowed_) {
+      return last_visible_shape_;
+    }
+
     const bool recent_input =
         last_input_ && now - *last_input_ < kInputActivityMs;
     const bool can_recover =
@@ -64,6 +85,8 @@ class CursorPresentation {
 
  private:
   bool sample_unavailable_ = false;
+  bool system_hidden_ = false;
+  bool mac_locator_allowed_ = true;
   bool no_device_ = false;
   bool fallback_engaged_ = false;
   std::optional<uint64_t> stale_at_;
@@ -74,4 +97,4 @@ class CursorPresentation {
 
 }  // namespace crossdesk
 
-#endif
+#endif