[VDS] Address review: dead code, chip reparenting, filter signal and sort fast-path

cockatrice/src/interface/widgets/visual_deck_storage/deck_preview/deck_preview_tag_display_widget.cpp

@@ -48,6 +48,7 @@ QSize DeckPreviewTagDisplayWidget::sizeHint() const
 
 void DeckPreviewTagDisplayWidget::mousePressEvent(QMouseEvent *event)
 {
+    const TagState previousState = state;
     switch (event->button()) {
         case Qt::LeftButton:
             setState(state != TagState::Selected ? TagState::Selected : TagState::NotSelected);
@@ -62,7 +63,12 @@ void DeckPreviewTagDisplayWidget::mousePressEvent(QMouseEvent *event)
             break;
     }
 
-    emit tagClicked();
+    // Only announce a change when the state was actually toggled, so a click that falls
+    // through the switch (e.g. a button the widget does not react to) does not drive a
+    // full tag-filter update and layout pass for nothing.
+    if (state != previousState) {
+        emit tagClicked();
+    }
     QWidget::mousePressEvent(event);
 }
 

cockatrice/src/interface/widgets/visual_deck_storage/deck_preview/deck_preview_tag_display_widget.h

@@ -48,7 +48,10 @@ public:
 
 signals:
     /**
-     * @brief Emitted when the tag is clicked.
+     * @brief Emitted when a click toggles the chip's selection/exclusion state.
+     *
+     * Not emitted for clicks that leave the state unchanged. Connected handlers use
+     * this as the trigger to update filters built from selectedTags()/excludedTags().
      */
     void tagClicked();
 

cockatrice/src/interface/widgets/visual_deck_storage/visual_deck_storage_search_widget.cpp

@@ -39,8 +39,3 @@ VisualDeckStorageSearchWidget::VisualDeckStorageSearchWidget(QWidget *parent) :
 
     connect(searchDebounceTimer, &QTimer::timeout, this, [this] { emit searchTextChanged(searchBar->text()); });
 }
-
-void VisualDeckStorageSearchWidget::setPlaceholderText(const QString &text)
-{
-    searchBar->setPlaceholderText(text);
-}

cockatrice/src/interface/widgets/visual_deck_storage/visual_deck_storage_search_widget.h

@@ -19,8 +19,6 @@ class VisualDeckStorageSearchWidget : public QWidget
 public:
     explicit VisualDeckStorageSearchWidget(QWidget *parent);
 
-    void setPlaceholderText(const QString &text);
-
 signals:
     /**
      * Emitted once the debounce timer fires after the user stopped typing.

cockatrice/src/interface/widgets/visual_deck_storage/visual_deck_storage_tag_filter_widget.cpp

@@ -38,15 +38,17 @@ void VisualDeckStorageTagFilterWidget::refreshTags()
 
     // Existing chips survive if their tag is still part of the deck set, or if the chip
     // is currently selected/excluded. Everything else is dropped. Dropped chips must NOT
-    // be re-added to the layout afterwards: they are scheduled for a deferred delete, and
-    // the flow layout would keep a dangling reference to them once the deletion runs on
-    // the next event-loop cycle.
+    // be re-added to the layout afterwards: they are reparented to nullptr and scheduled
+    // for a deferred delete (QWidget::setParent(nullptr) also hides them), and the flow
+    // layout would keep a dangling reference to them once the deletion runs on the next
+    // event-loop cycle.
     QList<DeckPreviewTagDisplayWidget *> chips;
     for (DeckPreviewTagDisplayWidget *tagWidget : findChildren<DeckPreviewTagDisplayWidget *>()) {
         if (tagWidget->getState() != TagState::NotSelected || allTags.contains(tagWidget->getTagName())) {
             chips.append(tagWidget);
         } else {
             flowWidget->removeWidget(tagWidget);
+            tagWidget->setParent(nullptr);
             tagWidget->deleteLater();
         }
     }
@@ -69,16 +71,22 @@ void VisualDeckStorageTagFilterWidget::refreshTags()
         }
     }
 
-    // Clear and re-add the chips in sorted order.
+    // Sort, but skip the full remove/re-add when the order already matches the layout.
+    // FlowWidget inherits QLayout::removeWidget's linear scan, so rebuilding an unchanged
+    // order would be quadratic plus a full relayout on every chip click and load batch.
     std::sort(chips.begin(), chips.end(), [](DeckPreviewTagDisplayWidget *a, DeckPreviewTagDisplayWidget *b) {
         return a->getTagName().toLower() < b->getTagName().toLower();
     });
+    if (chips == currentChipOrder) {
+        return;
+    }
     for (DeckPreviewTagDisplayWidget *tagWidget : chips) {
         flowWidget->removeWidget(tagWidget);
     }
     for (DeckPreviewTagDisplayWidget *tagWidget : chips) {
         flowWidget->addWidget(tagWidget);
     }
+    currentChipOrder = chips;
 }
 
 QStringList VisualDeckStorageTagFilterWidget::selectedTags() const

cockatrice/src/interface/widgets/visual_deck_storage/visual_deck_storage_tag_filter_widget.h

@@ -11,8 +11,8 @@
 #include <QWidget>
 #include <functional>
 
+class DeckPreviewTagDisplayWidget;
 class FlowWidget;
-class VisualDeckStorageWidget;
 
 class VisualDeckStorageTagFilterWidget : public QWidget
 {
@@ -20,6 +20,7 @@ class VisualDeckStorageTagFilterWidget : public QWidget
 
     FlowWidget *flowWidget;
     std::function<QSet<QString>()> allTagsProvider;
+    QList<DeckPreviewTagDisplayWidget *> currentChipOrder;
 
 public:
     explicit VisualDeckStorageTagFilterWidget(QWidget *parent = nullptr);
@@ -42,7 +43,10 @@ public:
 
 signals:
     /**
-     * Emitted whenever a chip's selection/exclusion state changes.
+     * Emitted when a chip's selection or exclusion state changes.
+     *
+     * The chip only emits when its state actually changed, so this fires once per
+     * effective toggle rather than on every click."
      */
     void filterChanged();