Limit media count in one HistoryGroupedMedia.

Telegram/SourceFiles/history/history_media.h

@@ -163,13 +163,6 @@ public:
 		const QRect &geometry,
 		QPoint point,
 		StateRequest request) const;
-	virtual std::unique_ptr<HistoryMedia> takeLastFromGroup() {
-		return nullptr;
-	}
-	virtual bool applyGroup(
-			const std::vector<not_null<HistoryItem*>> &items) {
-		return false;
-	}
 
 	virtual bool animating() const {
 		return false;

Telegram/SourceFiles/history/history_media_grouped.cpp

@@ -21,8 +21,12 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "layout.h"
 
 namespace {
+
 using TextState = HistoryView::TextState;
 using PointState = HistoryView::PointState;
+
+constexpr auto kMaxDisplayedGroupSize = 10;
+
 } // namespace
 
 HistoryGroupedMedia::Part::Part(not_null<HistoryItem*> item)
@@ -34,7 +38,11 @@ HistoryGroupedMedia::HistoryGroupedMedia(
 	const std::vector<not_null<HistoryItem*>> &items)
 : HistoryMedia(parent)
 , _caption(st::minPhotoSize - st::msgPadding.left() - st::msgPadding.right()) {
-	const auto result = applyGroup(items);
+	const auto result = (items.size() <= kMaxDisplayedGroupSize)
+		? applyGroup(items)
+		: applyGroup(std::vector<not_null<HistoryItem*>>(
+			begin(items),
+			begin(items) + kMaxDisplayedGroupSize));
 
 	Ensures(result);
 }
@@ -302,12 +310,10 @@ void HistoryGroupedMedia::clickHandlerPressedChanged(
 	}
 }
 
-std::unique_ptr<HistoryMedia> HistoryGroupedMedia::takeLastFromGroup() {
-	return std::move(_parts.back().content);
-}
-
 bool HistoryGroupedMedia::applyGroup(
 		const std::vector<not_null<HistoryItem*>> &items) {
+	Expects(items.size() <= kMaxDisplayedGroupSize);
+
 	if (items.empty()) {
 		return false;
 	}
@@ -315,14 +321,13 @@ bool HistoryGroupedMedia::applyGroup(
 		return true;
 	}
 
-	const auto pushElement = [&](not_null<HistoryItem*> item) {
+	for (const auto item : items) {
 		const auto media = item->media();
 		Assert(media != nullptr && media->canBeGrouped());
 
 		_parts.push_back(Part(item));
 		_parts.back().content = media->createView(_parent, item);
 	};
-	ranges::for_each(items, pushElement);
 	return true;
 }
 

Telegram/SourceFiles/history/history_media_grouped.h

@@ -59,10 +59,6 @@ public:
 		const ClickHandlerPtr &p,
 		bool pressed) override;
 
-	std::unique_ptr<HistoryMedia> takeLastFromGroup() override;
-	bool applyGroup(
-		const std::vector<not_null<HistoryItem*>> &items) override;
-
 	bool hasReplyPreview() const override;
 	ImagePtr replyPreview() override;
 	TextWithEntities getCaption() const override;
@@ -100,6 +96,7 @@ private:
 
 	};
 
+	bool applyGroup(const std::vector<not_null<HistoryItem*>> &items);
 	QSize countOptimalSize() override;
 	QSize countCurrentSize(int newWidth) override;