Method push

Tools/EditorFramework/pugixml.cpp:1779–1793

Push new gap, move s count bytes further (skipping the gap). Collapse previous gap.

	// Push new gap, move s count bytes further (skipping the gap).
	// Collapse previous gap.
	void push(char_t*& s, size_t count)
	{
		if (end) // there was a gap already; collapse it
		{
			// Move [old_gap_end, new_gap_start) to [old_gap_start, ...)
			assert(s >= end);
			memmove(end - size, end, reinterpret_cast<char*>(s) - reinterpret_cast<char*>(end));
		}

		s += count; // end of current gap

		// "merge" two gaps
		end = s;
		size += count;
	}

	// Collapse all gaps, return past-the-end pointer
	char_t* flush(char_t* s)