Fix community layer bottom edge case.

Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.cpp

@@ -2376,6 +2376,7 @@ void Suggestions::updateControlsGeometry() {
 	}
 
 	const auto expanding = false;
+	const auto contentTillBottom = true;
 	for (const auto &[key, list] : _mediaLists) {
 		const auto full = !list.wrap->scrollBottomSkip();
 		const auto additionalScroll = (full ? st::boxRadius : 0);
@@ -2384,6 +2385,7 @@ void Suggestions::updateControlsGeometry() {
 		list.wrap->updateGeometry(
 			wrapGeometry,
 			expanding,
+			contentTillBottom,
 			additionalScroll,
 			content.height());
 	}

Telegram/SourceFiles/info/community/info_community_widget.cpp

@@ -24,6 +24,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/rp_widget.h"
 #include "ui/ui_utility.h"
 #include "styles/style_info.h"
+#include "styles/style_layers.h"
 
 namespace Info::Community {
 
@@ -241,19 +242,22 @@ std::unique_ptr<Ui::RpWidget> Widget::setupAddChatButton() {
 		Dialogs::PaintBottomFade(p, wrap->width(), fadeHeight, st::boxBg);
 	});
 
-	scroll()->setVerticalBarBottomSkip(st::communityAddChatButtonMargin.top()
-		+ st::communityAddChatButton.height
-		+ st::communityAddChatButtonMargin.bottom());
-
 	widthValue() | rpl::on_next([=](int width) {
 		wrap->resizeToWidth(width);
 	}, wrap->lifetime());
 
 	rpl::combine(
 		wrap->heightValue(),
-		heightValue()
-	) | rpl::on_next([=](int height, int fullHeight) {
-		wrap->move(0, fullHeight - height);
+		heightValue(),
+		this->controller()->contentTillBottomValue()
+	) | rpl::on_next([=](int height, int fullHeight, bool tillBottom) {
+		const auto shift = tillBottom ? 0 : st::boxRadius;
+		wrap->move(0, fullHeight - height + shift);
+
+		const auto scrollSkip = st::communityAddChatButtonMargin.top()
+			+ st::communityAddChatButton.height
+			+ st::communityAddChatButtonMargin.bottom();
+		scroll()->setVerticalBarBottomSkip(scrollSkip - shift);
 	}, wrap->lifetime());
 
 	return result;

Telegram/SourceFiles/info/info_controller.cpp

@@ -393,6 +393,10 @@ rpl::producer<Wrap> Controller::wrapValue() const {
 	return _widget->wrapValue();
 }
 
+rpl::producer<bool> Controller::contentTillBottomValue() const {
+	return _widget->contentTillBottomValue();
+}
+
 not_null<Ui::RpWidget*> Controller::wrapWidget() const {
 	return _widget;
 }

Telegram/SourceFiles/info/info_controller.h

@@ -326,6 +326,7 @@ public:
 	[[nodiscard]] Wrap wrap() const;
 	[[nodiscard]] rpl::producer<Wrap> wrapValue() const;
 	[[nodiscard]] not_null<Ui::RpWidget*> wrapWidget() const;
+	[[nodiscard]] rpl::producer<bool> contentTillBottomValue() const;
 	void setSection(not_null<ContentMemento*> memento);
 	[[nodiscard]] bool hasBackButton() const;
 

Telegram/SourceFiles/info/info_layer_widget.cpp

@@ -331,7 +331,7 @@ QRect LayerWidget::countGeometry(int newWidth) {
 		contentTop,
 		contentWidth,
 		contentHeight,
-	}, expanding, additionalScroll, maxVisibleHeight);
+	}, expanding, _contentTillBottom, additionalScroll, maxVisibleHeight);
 
 	return QRect(newLeft, newTop, newWidth, desiredHeight);
 }

Telegram/SourceFiles/info/info_section_widget.cpp

@@ -50,6 +50,7 @@ void SectionWidget::init() {
 		return (_content != nullptr);
 	}) | rpl::on_next([=](QSize size, int) {
 		const auto expanding = false;
+		const auto contentTillBottom = true;
 		const auto full = !_content->scrollBottomSkip();
 		const auto additionalScroll = (full ? st::boxRadius : 0);
 		const auto height = size.height() - (full ? 0 : st::boxRadius);
@@ -57,6 +58,7 @@ void SectionWidget::init() {
 		_content->updateGeometry(
 			wrapGeometry,
 			expanding,
+			contentTillBottom,
 			additionalScroll,
 			size.height());
 	}, lifetime());

Telegram/SourceFiles/info/info_wrap_widget.cpp

@@ -772,6 +772,10 @@ void WrapWidget::setWrap(Wrap wrap) {
 	_wrap = wrap;
 }
 
+rpl::producer<bool> WrapWidget::contentTillBottomValue() const {
+	return _contentTillBottom.value();
+}
+
 rpl::producer<> WrapWidget::contentChanged() const {
 	return _contentChanges.events();
 }
@@ -1107,6 +1111,7 @@ object_ptr<Ui::RpWidget> WrapWidget::createTopBarSurrogate(
 void WrapWidget::updateGeometry(
 		QRect newGeometry,
 		bool expanding,
+		bool contentTillBottom,
 		int additionalScroll,
 		int maxVisibleHeight) {
 	auto scrollChanged = (_additionalScroll != additionalScroll);
@@ -1115,6 +1120,7 @@ void WrapWidget::updateGeometry(
 	_additionalScroll = additionalScroll;
 	_maxVisibleHeight = maxVisibleHeight;
 	_expanding = expanding;
+	_contentTillBottom = contentTillBottom;
 
 	_content->applyMaxVisibleHeight(maxVisibleHeight);
 

Telegram/SourceFiles/info/info_wrap_widget.h

@@ -93,17 +93,18 @@ public:
 		Wrap wrap,
 		not_null<Memento*> memento);
 
-	Key key() const;
+	[[nodiscard]] Key key() const;
 	Dialogs::RowDescriptor activeChat() const override;
-	Wrap wrap() const {
+	[[nodiscard]] Wrap wrap() const {
 		return _wrap.current();
 	}
-	rpl::producer<Wrap> wrapValue() const;
+	[[nodiscard]] rpl::producer<Wrap> wrapValue() const;
 	void setWrap(Wrap wrap);
 
-	rpl::producer<> contentChanged() const;
+	[[nodiscard]] rpl::producer<bool> contentTillBottomValue() const;
+	[[nodiscard]] rpl::producer<> contentChanged() const;
 
-	not_null<Controller*> controller() {
+	[[nodiscard]] not_null<Controller*> controller() {
 		return _controller.get();
 	}
 
@@ -137,6 +138,7 @@ public:
 	void updateGeometry(
 		QRect newGeometry,
 		bool expanding,
+		bool contentTillBottom,
 		int additionalScroll,
 		int maxVisibleHeight);
 	[[nodiscard]] int scrollBottomSkip() const;
@@ -229,6 +231,7 @@ private:
 	int _maxVisibleHeight = 0;
 	bool _expanding = false;
 	rpl::variable<bool> _grabbingForExpanding = false;
+	rpl::variable<bool> _contentTillBottom = false;
 	object_ptr<TopBar> _topBar = { nullptr };
 	object_ptr<Ui::RpWidget> _topBarSurrogate = { nullptr };
 	Ui::Animations::Simple _topBarOverrideAnimation;