fix(sync): reply to queries with steps since last save

This was a very inefficient attempt to resync
that we did not even process on the client side.

Only the steps since the last save may not be enough
to get back in sync.
However we can expand this by including the document state
or storing it as the first step after a save.

Signed-off-by: Max <max@nextcloud.com>

lib/Service/DocumentService.php

@@ -228,8 +228,10 @@ public function addStep(Document $document, Session $session, array $steps, int
 			}
 			$newVersion = $this->insertSteps($document, $session, $stepsToInsert);
 		}
-		// If there were any queries in the steps send the entire history
-		$getStepsSinceVersion = count($querySteps) > 0 ? 0 : $version;
+		// If there were any queries in the steps send all steps since last save.
+		$getStepsSinceVersion = count($querySteps) > 0
+			? $document->getLastSavedVersion()
+			: $version;
 		$allSteps = $this->getSteps($documentId, $getStepsSinceVersion);
 		$stepsToReturn = [];
 		foreach ($allSteps as $step) {