A somewhat workable solution (that still doesn't downsize correctly)

cockatrice/src/client/tabs/api/edhrec/edhrec_commander_api_response_card_list_display_widget.cpp

@@ -11,13 +11,13 @@ EdhrecCommanderApiResponseCardListDisplayWidget::EdhrecCommanderApiResponseCardL
 {
     layout = new QVBoxLayout(this);
     setLayout(layout);
-    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+
-    setMinimumSize(0, 0);
+    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Minimum);
 
     auto header = new QLabel(this);
     header->setText(toDisplay.header);
 
-    flowWidget = new FlowWidget(this, Qt::ScrollBarAlwaysOff, Qt::ScrollBarAsNeeded);
+    flowWidget = new FlowWidget(this, Qt::Horizontal, Qt::ScrollBarAlwaysOff, Qt::ScrollBarAlwaysOff);
 
     foreach (EdhrecCommanderApiResponseCardDetails card_detail, toDisplay.cardViews) {
         auto widget = new EdhrecCommanderApiResponseCardDetailsDisplayWidget(flowWidget, card_detail);
@@ -27,3 +27,9 @@ EdhrecCommanderApiResponseCardListDisplayWidget::EdhrecCommanderApiResponseCardL
     layout->addWidget(header);
     layout->addWidget(flowWidget);
 }
+
+void EdhrecCommanderApiResponseCardListDisplayWidget::resizeEvent(QResizeEvent *event)
+{
+    QWidget::resizeEvent(event);
+    qDebug() << event->size();
+}

cockatrice/src/client/tabs/api/edhrec/edhrec_commander_api_response_card_list_display_widget.h

@@ -4,6 +4,7 @@
 #include "../../../ui/widgets/general/layout_containers/flow_widget.h"
 #include "api_response/edhrec_commander_api_response_card_list.h"
 
+#include <QResizeEvent>
 #include <QVBoxLayout>
 #include <QWidget>
 
@@ -13,6 +14,7 @@ class EdhrecCommanderApiResponseCardListDisplayWidget : public QWidget
 public:
     explicit EdhrecCommanderApiResponseCardListDisplayWidget(QWidget *parent,
                                                              EdhrecCommanderApiResponseCardList toDisplay);
+    void resizeEvent(QResizeEvent *event) override;
 
 private:
     QVBoxLayout *layout;

cockatrice/src/client/tabs/api/edhrec/edhrec_commander_api_response_display_widget.cpp

@@ -21,12 +21,12 @@ EdhrecCommanderApiResponseDisplayWidget::EdhrecCommanderApiResponseDisplayWidget
     auto commanderPicture = new CardInfoPictureWidget(this);
     commanderPicture->setCard(
         CardDatabaseManager::getInstance()->getCard(response.container.getCommanderDetails().getName()));
-    layout->addWidget(commanderPicture, 0, Qt::AlignHCenter);
+    layout->addWidget(commanderPicture);
 
     auto edhrec_commander_api_response_card_lists = response.container.getCardlists();
     foreach (EdhrecCommanderApiResponseCardList card_list, edhrec_commander_api_response_card_lists) {
         auto cardListDisplayWidget = new EdhrecCommanderApiResponseCardListDisplayWidget(this, card_list);
-        layout->addWidget(cardListDisplayWidget, 0, Qt::AlignHCenter);
+        layout->addWidget(cardListDisplayWidget);
     }
 }
 
@@ -34,4 +34,7 @@ void EdhrecCommanderApiResponseDisplayWidget::resizeEvent(QResizeEvent *event)
 {
     QWidget::resizeEvent(event);
     qDebug() << event->size();
+    layout->invalidate();
+    layout->activate();
+    layout->update();
 }

cockatrice/src/client/tabs/api/edhrec/tab_edhrec.cpp

@@ -15,10 +15,13 @@ TabEdhRec::TabEdhRec(TabSupervisor *_tabSupervisor) : Tab(_tabSupervisor)
 {
     setMinimumSize(0, 0);
 
-
+    scrollArea = new QScrollArea();
-    flowWidget = new FlowWidget(this, Qt::ScrollBarAlwaysOff, Qt::ScrollBarAsNeeded);
+    scrollArea->setWidgetResizable(true);
+    scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    // flowWidget = new FlowWidget(this, Qt::Vertical, Qt::ScrollBarAlwaysOff, Qt::ScrollBarAsNeeded);
     networkManager = new QNetworkAccessManager(this);
-    setCentralWidget(flowWidget);
+    setCentralWidget(scrollArea);
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     networkManager->setTransferTimeout(); // Use Qt's default timeout
 #endif
@@ -74,8 +77,9 @@ void TabEdhRec::processApiJson(QNetworkReply *reply)
     EdhrecCommanderApiResponse deckData;
     deckData.fromJson(jsonObj);
 
-    displayWidget = new EdhrecCommanderApiResponseDisplayWidget(flowWidget, deckData);
+    displayWidget = new EdhrecCommanderApiResponseDisplayWidget(this, deckData);
-    flowWidget->addWidget(displayWidget);
+    // flowWidget->addWidget(displayWidget);
+    scrollArea->setWidget(displayWidget);
 
     reply->deleteLater();
     update();

cockatrice/src/client/tabs/api/edhrec/tab_edhrec.h

@@ -30,7 +30,7 @@ public slots:
     void setCard(CardInfoPtr _cardToQuery);
 
 private:
-    FlowWidget *flowWidget;
+    QScrollArea *scrollArea;
     CardInfoPtr cardToQuery;
     EdhrecCommanderApiResponseDisplayWidget *displayWidget;
 };