Method UpdateVisibleIterators

src/textfile_gui.cpp:695–703

}

void TextfileWindow::UpdateVisibleIterators()
{
	int pos = this->vscroll->GetPosition();
	int cap = this->vscroll->GetCapacity();
	this->visible_first = this->GetIteratorFromPosition(pos);

	/* The last visible iterator ignores line wrapping so that it does not need to change when line heights change. */
	this->visible_last = std::ranges::next(this->visible_first, cap + 1, std::end(this->lines));
}

void TextfileWindow::OnScrollbarScroll(WidgetID widget)
{