don't set preedit on async commit (#235)

Author: eagleoflqj

macosfrontend/macosfrontend.cpp

@@ -224,7 +224,10 @@ void MacosInputContext::commitStringImpl(const std::string &text) {
     // committed in next commit with a key event. e.g. fcitx commits a ，
     // asynchronously when deleting , after a number/English character.
     if (!isSyncEvent) {
-        commitAndSetPreeditAsync();
+        // When changing this, test Messages.app by clicking a candidate.
+        // Previously buggy behavior is that preedit is appended after commit.
+        SwiftFrontend::commitAsync(client_, state_.commit);
+        resetState();
     }
 }
 

macosfrontend/macosfrontend.swift

@@ -70,6 +70,16 @@ public func commitAndSetPreeditAsync(
   }
 }
 
+public func commitAsync(_ clientPtr: UnsafeMutableRawPointer, _ commit: String) {
+  let client: AnyObject = Unmanaged.fromOpaque(clientPtr).takeUnretainedValue()
+  guard let client = client as? IMKTextInput else {
+    return
+  }
+  DispatchQueue.main.async {
+    commitString(client, commit)
+  }
+}
+
 public func getCursorCoordinates(
   _ clientPtr: UnsafeMutableRawPointer,
   _ followCursor: Bool,