Scroll quote selection in the draft options box.

Telegram/SourceFiles/history/view/controls/history_view_draft_options.cpp

@@ -110,6 +110,10 @@ class PreviewWrap final : public Ui::RpWidget {
 		const std::vector<MessageLinkRange> &links,
 		const QString &usedLink);
 
+	[[nodiscard]] rpl::producer<int> draggingScrollDelta() const {
+		return _draggingScrollDelta.events();
+	}
+
 private:
 	void paintEvent(QPaintEvent *e) override;
 	void leaveEventHook(QEvent *e) override;
@@ -118,6 +122,11 @@ class PreviewWrap final : public Ui::RpWidget {
 	void mouseReleaseEvent(QMouseEvent *e) override;
 	void mouseDoubleClickEvent(QMouseEvent *e) override;
 
+	void visibleTopBottomUpdated(int top, int bottom) override {
+		_visibleTop = top;
+		_visibleBottom = bottom;
+	}
+
 	void initElement();
 	void highlightUsedLink(
 		const TextWithTags &message,
@@ -141,6 +150,9 @@ class PreviewWrap final : public Ui::RpWidget {
 	rpl::lifetime _elementLifetime;
 
 	QPoint _position;
+	rpl::event_stream<int> _draggingScrollDelta;
+	int _visibleTop = 0;
+	int _visibleBottom = 0;
 
 	base::Timer _trippleClickTimer;
 	ClickHandlerPtr _link;
@@ -423,9 +435,8 @@ void PreviewWrap::mouseMoveEvent(QMouseEvent *e) {
 			: Flag::LookupLink),
 		.onlyMessageText = (_section == Section::Link || _onlyMessageText),
 	};
-	auto resolved = _element->textState(
-		e->pos() - _position,
-		request);
+	const auto position = e->pos();
+	auto resolved = _element->textState(position - _position, request);
 	_over = true;
 	const auto text = (_section == Section::Reply)
 		&& (resolved.cursor == CursorState::Text);
@@ -450,6 +461,17 @@ void PreviewWrap::mouseMoveEvent(QMouseEvent *e) {
 			update();
 		}
 	}
+
+	_draggingScrollDelta.fire([&] {
+		if (!_selecting || _visibleTop >= _visibleBottom) {
+			return 0;
+		} else if (position.y() < _visibleTop) {
+			return position.y() - _visibleTop;
+		} else if (position.y() >= _visibleBottom) {
+			return position.y() + 1 - _visibleBottom;
+		}
+		return 0;
+	}());
 }
 
 void PreviewWrap::mousePressEvent(QMouseEvent *e) {
@@ -814,6 +836,11 @@ void DraftOptionsBox(
 	state->wrap = box->addRow(
 		object_ptr<PreviewWrap>(box, args.history),
 		{});
+	state->wrap->draggingScrollDelta(
+	) | rpl::start_with_next([=](int delta) {
+		box->scrollByDraggingDelta(delta);
+	}, state->wrap->lifetime());
+
 	const auto &linkRanges = args.links;
 	state->shown.value() | rpl::start_with_next([=](Section shown) {
 		bottom->clear();

Telegram/SourceFiles/history/view/history_view_message.cpp

@@ -2400,8 +2400,10 @@ TextState Message::textState(
 	const auto media = this->media();
 
 	auto result = TextState(item);
+	const auto visibleMediaTextLen = visibleMediaTextLength();
+	const auto visibleTextLen = visibleTextLength();
 	const auto minSymbol = (_invertMedia && request.onlyMessageText)
-		? visibleMediaTextLength()
+		? visibleMediaTextLen
 		: 0;
 	result.symbol = minSymbol;
 
@@ -2428,6 +2430,7 @@ TextState Message::textState(
 		g.setHeight(g.height() - reactionsHeight);
 		const auto reactionsPosition = QPoint(reactionsLeft + g.left(), g.top() + g.height() + st::mediaInBubbleSkip);
 		if (_reactions->getState(point - reactionsPosition, &result)) {
+			result.symbol += visibleMediaTextLen + visibleTextLen;
 			return result;
 		}
 	}
@@ -2443,6 +2446,7 @@ TextState Message::textState(
 
 		auto inner = g;
 		if (getStateCommentsButton(point, inner, &result)) {
+			result.symbol += visibleMediaTextLen + visibleTextLen;
 			return result;
 		}
 		auto trect = inner.marginsRemoved(st::msgPadding);
@@ -2460,6 +2464,7 @@ TextState Message::textState(
 			trect.setHeight(trect.height() - reactionsHeight);
 			const auto reactionsPosition = QPoint(trect.left(), trect.top() + trect.height() + reactionsTop);
 			if (_reactions->getState(point - reactionsPosition, &result)) {
+				result.symbol += visibleMediaTextLen + visibleTextLen;
 				return result;
 			}
 		}
@@ -2475,6 +2480,7 @@ TextState Message::textState(
 						? inner
 						: inner - heightMargins),
 					&result)) {
+				result.symbol += visibleMediaTextLen + visibleTextLen;
 				return result;
 			}
 			if (belowInfo) {
@@ -2552,7 +2558,11 @@ TextState Message::textState(
 				result = bottomInfoResult;
 			}
 		};
-		if (result.symbol <= minSymbol && inBubble) {
+		if (!inBubble) {
+			if (point.y() >= g.y() + g.height()) {
+				result.symbol += visibleTextLen + visibleMediaTextLen;
+			}
+		} else if (result.symbol <= minSymbol) {
 			const auto mediaHeight = mediaDisplayed ? media->height() : 0;
 			const auto mediaLeft = trect.x() - st::msgPadding.left();
 			const auto mediaTop = (!mediaDisplayed || _invertMedia)
@@ -2575,22 +2585,21 @@ TextState Message::textState(
 						result.cursor = CursorState::None;
 					}
 				} else if (request.onlyMessageText) {
-					result.symbol = visibleTextLength();
+					result.symbol = visibleTextLen;
 					result.afterSymbol = false;
 					result.cursor = CursorState::None;
 				} else {
-					result.symbol += visibleTextLength();
+					result.symbol += visibleTextLen;
 				}
 			} else if (getStateText(point, trect, &result, request)) {
 				if (_invertMedia) {
-					result.symbol += visibleMediaTextLength();
+					result.symbol += visibleMediaTextLen;
 				}
 				result.overMessageText = true;
 				checkBottomInfoState();
 				return result;
 			} else if (point.y() >= trect.y() + trect.height()) {
-				result.symbol = visibleTextLength()
-					+ visibleMediaTextLength();
+				result.symbol = visibleTextLen + visibleMediaTextLen;
 			}
 		}
 		checkBottomInfoState();