LocationCompleterView: Delay resizing popup to reduce flicker

src/lib/navigation/completer/locationcompleterview.cpp

@@ -123,7 +123,32 @@ void LocationCompleterView::setOriginalText(const QString &originalText)
 void LocationCompleterView::adjustSize()
 {
     const int maxItemsCount = 12;
-    m_view->setFixedHeight(m_view->sizeHintForRow(0) * qMin(maxItemsCount, model()->rowCount()) + 2 * m_view->frameWidth());
+    const int newHeight = m_view->sizeHintForRow(0) * qMin(maxItemsCount, model()->rowCount()) + 2 * m_view->frameWidth();
+
+    if (!m_resizeTimer) {
+        m_resizeTimer = new QTimer(this);
+        m_resizeTimer->setInterval(200);
+        connect(m_resizeTimer, &QTimer::timeout, this, [this]() {
+            if (m_resizeHeight > 0) {
+                m_view->setFixedHeight(m_resizeHeight);
+                setFixedHeight(sizeHint().height());
+            }
+            m_resizeHeight = -1;
+        });
+    }
+
+    if (newHeight == m_view->height() || newHeight == m_resizeHeight) {
+        return;
+    }
+
+    if (newHeight < m_view->height()) {
+        m_resizeHeight = newHeight;
+        m_resizeTimer->start();
+        return;
+    }
+
+    m_resizeHeight = -1;
+    m_view->setFixedHeight(newHeight);
     setFixedHeight(sizeHint().height());
 }
 

src/lib/navigation/completer/locationcompleterview.h

@@ -25,6 +25,7 @@
 class LoadRequest;
 class LocationCompleterDelegate;
 
+class QTimer;
 class QHBoxLayout;
 
 class FALKON_EXPORT LocationCompleterView : public QWidget
@@ -67,6 +68,8 @@ private:
     LocationCompleterDelegate *m_delegate;
     QHBoxLayout *m_searchEnginesLayout;
     QString m_originalText;
+    int m_resizeHeight = -1;
+    QTimer *m_resizeTimer = nullptr;
 };
 
 #endif // LOCATIONCOMPLETERVIEW_H