Paragraph: Added Prepend(TextSpan).

src/apps/haiku-depot/textview/Paragraph.cpp

@@ -66,6 +66,22 @@ Paragraph::SetStyle(const ParagraphStyle& style)
 }
 
 
+bool
+Paragraph::Prepend(const TextSpan& span)
+{
+	// Try to merge with first span if the TextStyles are equal
+	if (fTextSpans.CountItems() > 0) {
+		const TextSpan& firstSpan = fTextSpans.ItemAtFast(0);
+		if (firstSpan.Style() == span.Style()) {
+			BString text(span.Text());
+			text.Append(firstSpan.Text());
+			return fTextSpans.Replace(0, TextSpan(text, span.Style()));
+		}
+	}
+	return fTextSpans.Add(span, 0);
+}
+
+
 bool
 Paragraph::Append(const TextSpan& span)
 {

src/apps/haiku-depot/textview/Paragraph.h

@@ -30,6 +30,7 @@ public:
 	inline	const TextSpanList&	TextSpans() const
 									{ return fTextSpans; }
 
+			bool				Prepend(const TextSpan& span);
 			bool				Append(const TextSpan& span);
 			bool				Insert(int32 offset, const TextSpan& span);
 			bool				Remove(int32 offset, int32 length);