async-notification (#4759)

* async-notification

The previous synchronous callWithArgumentList stalled the main thread for the QtDBus reply timeout (~25s) after every capture, freezing further captures until it returned. Probably related to Issue #2425.

* Fix missing closing curly brace

* clang-format

---------

Co-authored-by: Mehrad Mahmoudian <m.mahmoudian@gmail.com>

Author: ferdna

src/utils/systemnotification.cpp

@@ -90,8 +90,16 @@ void SystemNotification::sendMessage(const QString& text,
              << QStringList()                // actions
              << hintsMap                     // hints
              << timeout;                     // timeout
-        m_interface->callWithArgumentList(
-          QDBus::AutoDetect, QStringLiteral("Notify"), args);
+        // Fire-and-forget: an asynchronous call never blocks the event loop,
+        // even when no notification daemon is registered on the session bus
+        // (e.g. bare startx / tiling WM sessions). The previous synchronous
+        // callWithArgumentList stalled the main thread for the QtDBus reply
+        // timeout (~25s) after every capture, freezing further captures until
+        // it returned.
+        if (m_interface != nullptr) {
+            m_interface->asyncCallWithArgumentList(QStringLiteral("Notify"),
+                                                   args);
+        }
     }
 #endif
 }