Fixed code to support contribution search for soft credit filter

softcreditcustomfields.php

@@ -335,3 +335,21 @@ function softcreditcustomfields_civicrm_queryObjects(&$queryObjects, $type) {
     $queryObjects[] = new CRM_SoftCredit_SoftCreditQueryObject();
   }
 }
+
+/**
+ * Implements hook_civicrm_queryObjects().
+ *
+ * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_queryObjects
+ */
+function softcreditcustomfields_civicrm_alterContent(&$content, $context, $tplName, &$object) {
+  if (in_array($tplName, [
+    'CRM/Contribute/Form/Search/AdvancedSearchPane.tpl',
+    'CRM/Contribute/Form/Search.tpl'
+  ])) {
+    $content = str_replace(
+      "cj('#contribution_soft_credit_type_id').val('');", 
+      '', 
+      $content
+    );
+  }
+}