TextDocumentLayout: Remove any extra ParagraphLayouts ...

... when adapting to changes in the TextDocument. There should be more
explicit listener support for keeping the TextDocumentLayout in sync with
the document.

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

@@ -101,6 +101,10 @@ TextDocumentLayout::InvalidateParagraphs(int32 start, int32 count)
 		start++;
 		count--;
 	}
+
+	// Remove any extra paragraph layouts
+	while (paragraphs.CountItems() < fParagraphLayouts.CountItems())
+		fParagraphLayouts.Remove(fParagraphLayouts.CountItems() - 1);
 }