D19748.diff
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D19748.diff
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	diff --git a/src/applications/differential/engine/DifferentialChangesetEngine.php b/src/applications/differential/engine/DifferentialChangesetEngine.php
	--- a/src/applications/differential/engine/DifferentialChangesetEngine.php
	+++ b/src/applications/differential/engine/DifferentialChangesetEngine.php
	@@ -88,6 +88,20 @@


	private function detectCopiedCode(array $changesets) {
	+ // See PHI944. If the total number of changed lines is excessively large,
	+ // don't bother with copied code detection. This can take a lot of time and
	+ // memory and it's not generally of any use for very large changes.
	+ $max_size = 65535;
	+
	+ $total_size = 0;
	+ foreach ($changesets as $changeset) {
	+ $total_size += ($changeset->getAddLines() + $changeset->getDelLines());
	+ }
	+
	+ if ($total_size > $max_size) {
	+ return;
	+ }
	+
	$min_width = 30;
	$min_lines = 3;