fix: timestamp shows yesterday for a message received 3 days ago

- introduce one global update timer, to be used in various components
for date/time sensitive updates
- this timer runs only when the app is/becomes active
- use the timer's `triggered()` signal to update the timestamp label
when needed; ie. if it's to display a relative timestamp and it's
currently visible

Fixes #11460

ui/StatusQ/include/StatusQ/sharedupdatetimer.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <QObject>
+#include <QTimer>
+
+class SharedUpdateTimer : public QObject
+{
+    Q_OBJECT
+public:
+    explicit SharedUpdateTimer(QObject* parent = nullptr);
+
+signals:
+    void triggered();
+
+private:
+    QTimer m_timer;
+};

ui/StatusQ/src/StatusQ/Components/StatusTimeStampLabel.qml

@@ -12,7 +12,24 @@ StatusBaseText {
     color: Theme.palette.baseColor1
     font.pixelSize: 10
     visible: !!text
-    text: showFullTimestamp ? LocaleUtils.formatDateTime(timestamp) : LocaleUtils.formatRelativeTimestamp(timestamp)
+    text: d.formattedLabel
+
+    QtObject {
+        id: d
+        property string formattedLabel: showFullTimestamp ? LocaleUtils.formatDateTime(root.timestamp) : LocaleUtils.formatRelativeTimestamp(root.timestamp)
+
+        readonly property var _conn: Connections {
+            target: SharedUpdateTimer
+            enabled: root.visible && root.timestamp && !root.showFullTimestamp
+            function onTriggered() {
+                const newFormattedLabel = LocaleUtils.formatRelativeTimestamp(root.timestamp)
+                if (newFormattedLabel !== d.formattedLabel) {
+                    d.formattedLabel = newFormattedLabel
+                }
+            }
+        }
+    }
+
     StatusToolTip {
         id: tooltip
         visible: hhandler.hovered && !!text

ui/StatusQ/src/plugin.cpp

@@ -14,6 +14,7 @@
 #include "StatusQ/permissionutilsinternal.h"
 #include "StatusQ/rolesrenamingmodel.h"
 #include "StatusQ/rxvalidator.h"
+#include "StatusQ/sharedupdatetimer.h"
 #include "StatusQ/statussyntaxhighlighter.h"
 #include "StatusQ/statuswindow.h"
 #include "StatusQ/stringutilsinternal.h"
@@ -57,6 +58,9 @@ class StatusQPlugin : public QQmlExtensionPlugin
         qmlRegisterType<WritableProxyModel>("StatusQ", 0, 1, "WritableProxyModel");
         qmlRegisterType<FormattedDoubleProperty>("StatusQ", 0, 1, "FormattedDoubleProperty");
 
+        qmlRegisterSingletonType<SharedUpdateTimer>(
+            "StatusQ.Core", 0, 1, "SharedUpdateTimer", [](QQmlEngine*, QJSEngine*) { return new SharedUpdateTimer; });
+
         qmlRegisterSingletonType<QClipboardProxy>("StatusQ", 0, 1, "QClipboardProxy", &QClipboardProxy::qmlInstance);
 
         qmlRegisterSingletonType<ModelUtilsInternal>(

ui/StatusQ/src/sharedupdatetimer.cpp

@@ -0,0 +1,23 @@
+#include "StatusQ/sharedupdatetimer.h"
+
+#include <QGuiApplication>
+
+using namespace std::chrono_literals;
+
+SharedUpdateTimer::SharedUpdateTimer(QObject* parent)
+    : QObject{parent}
+{
+    m_timer.setTimerType(Qt::VeryCoarseTimer);
+    m_timer.setInterval(1s);
+
+    connect(&m_timer, &QTimer::timeout, this, &SharedUpdateTimer::triggered);
+    connect(qApp, &QGuiApplication::applicationStateChanged, this, [this](Qt::ApplicationState state) {
+        if (state == Qt::ApplicationActive) {
+            emit triggered(); // emulate QML Timer's `triggeredOnStart`
+            m_timer.start();
+        }
+        else {
+            m_timer.stop();
+        }
+    });
+}