Add polyfill for Number.isInteger (fixes #326)

Signed-off-by: Julius Härtl <jus@bitgrid.net>

js/documents.js

@@ -117,6 +117,15 @@ $.widget('oc.documentOverlay', {
 	}
 });
 
+// Polyfill for Number.isInteger
+// FIXME: Remove once Nextcloud 15 is the minimum required version
+// since es6-shim is shipped for that
+Number.isInteger = Number.isInteger || function(value) {
+	return typeof value === 'number' &&
+		isFinite(value) &&
+		Math.floor(value) === value;
+};
+
 var documentsMain = {
 	isEditorMode : false,
 	isViewerMode: false,