Improve blockquote / pre layout.

ui/text/text.cpp

@@ -1225,8 +1225,8 @@ bool String::hasNotEmojiAndSpaces() const {
 	return _hasNotEmojiAndSpaces;
 }
 
-const base::flat_map<int, Deltas> &String::modifications() const {
-	static const auto kEmpty = base::flat_map<int, Deltas>();
+const std::vector<Modification> &String::modifications() const {
+	static const auto kEmpty = std::vector<Modification>();
 	return _extended ? _extended->modifications : kEmpty;
 }
 

ui/text/text.h

@@ -83,9 +83,10 @@ struct SpoilerData;
 struct ParagraphDetails;
 struct ExtendedData;
 
-struct Deltas {
-	uint16 added = 0;
-	uint16 removed = 0;
+struct Modification {
+	int position = 0;
+	uint16 skipped = 0;
+	bool added = false;
 };
 
 struct StateRequest {
@@ -341,7 +342,7 @@ public:
 	[[nodiscard]] OnlyCustomEmoji toOnlyCustomEmoji() const;
 
 	[[nodiscard]] bool hasNotEmojiAndSpaces() const;
-	[[nodiscard]] const base::flat_map<int, Deltas> &modifications() const;
+	[[nodiscard]] const std::vector<Modification> &modifications() const;
 
 	[[nodiscard]] const style::TextStyle *style() const {
 		return _st;

ui/text/text_block.cpp

@@ -388,9 +388,7 @@ style::font WithFlags(
 		|| (fontFlags & FontSemibold)) {
 		result = result->semibold();
 	}
-	if ((flags & TextBlockFlag::Italic)
-		|| (fontFlags & FontItalic)
-		|| (flags & TextBlockFlag::Blockquote)) {
+	if ((flags & TextBlockFlag::Italic) || (fontFlags & FontItalic)) {
 		result = result->italic();
 	}
 	if ((flags & TextBlockFlag::Underline) || (fontFlags & FontUnderline)) {

ui/text/text_extended_data.h

@@ -12,8 +12,7 @@
 
 namespace Ui::Text {
 
-struct Deltas;
-
+struct Modification;
 class String;
 
 class SpoilerClickHandler final : public ClickHandler {
@@ -59,7 +58,7 @@ struct ExtendedData {
 	std::vector<ClickHandlerPtr> links;
 	std::vector<ParagraphDetails> paragraphs;
 	std::unique_ptr<SpoilerData> spoiler;
-	base::flat_map<int, Deltas> modifications;
+	std::vector<Modification> modifications;
 };
 
 } // namespace Ui::Text

ui/text/text_parser.cpp

@@ -603,11 +603,25 @@ bool Parser::isLinkEntity(const EntityInText &entity) const {
 }
 
 void Parser::updateModifications(int index, int delta) {
-	auto &deltas = _t->ensureExtended()->modifications[index];
-	if (delta > 0) {
-		deltas.added += delta;
+	auto &modifications = _t->ensureExtended()->modifications;
+	auto i = end(modifications);
+	while (i != begin(modifications) && (--i)->position >= index) {
+		if (i->position < index) {
+			break;
+		} else if (delta > 0) {
+			++i->position;
+		} else if (i->position == index) {
+			break;
+		}
+	}
+	if (i != end(modifications) && i->position == index) {
+		++i->skipped;
 	} else {
-		deltas.removed -= delta;
+		modifications.insert(i, {
+			.position = index,
+			.skipped = uint16(delta < 0 ? 1 : 0),
+			.added = (delta > 0),
+		});
 	}
 }
 

ui/text/text_renderer.cpp

@@ -433,6 +433,18 @@ void Renderer::fillParagraphBg(int paddingBottom) {
 			.skipTop = !isTop,
 			.skipBottom = !isBottom,
 		});
+
+		if (isTop && cache->withHeader) {
+			const auto font = _t->_st->font->monospace();
+			const auto topleft = rect.topLeft();
+			const auto position = topleft + _t->_st->blockHeaderPosition;
+			const auto baseline = position + QPoint(0, font->ascent);
+			_p->setFont(font);
+			_p->setPen(_palette->monoFg->p);
+			_p->drawText(baseline, _paragraph->language.isEmpty()
+				? u"code"_q
+				: _paragraph->language);
+		}
 	}
 	_blockLineTop = _y + _lineHeight + paddingBottom;
 }
@@ -2094,7 +2106,7 @@ void Renderer::applyBlockProperties(const AbstractBlock *block) {
 				_currentPen = &_originalPen;
 				_currentPenSelected = &_originalPenSelected;
 			}
-		} else if (isMono || (flags & TextBlockFlag::Blockquote)) {
+		} else if (isMono) {
 			_currentPen = &_palette->monoFg->p;
 			_currentPenSelected = &_palette->selectMonoFg->p;
 		} else if (block->linkIndex()) {