Always open the user details dialog in the focused window

This fixes some odd UX where you tap on someone's user in a search or
pinned messages window, but it opens in the NeoChat main window instead.

Fixes #681

src/utils.cpp

@@ -13,6 +13,7 @@
 #include <Quotient/connection.h>
 
 #include <QJsonDocument>
+#include <QQuickWindow>
 
 using namespace Quotient;
 
@@ -37,6 +38,16 @@ QColor QmlUtils::getUserColor(qreal hueF)
     return QColor::fromHslF(hueF, 1, -0.7 * lightness + 0.9, 1);
 }
 
+QQuickItem *QmlUtils::focusedWindowItem()
+{
+    const auto window = qobject_cast<QQuickWindow *>(QGuiApplication::focusWindow());
+    if (window) {
+        return window->contentItem();
+    } else {
+        return nullptr;
+    }
+}
+
 bool Utils::isEmoji(const QString &text)
 {
 #ifdef HAVE_ICU