1. Create two courses with quizzes
2. Switch one course to the grid format
3. Import quiz from the other course into this one

Expected result:
Quiz imports sucessfully

Actual result:
Import fails with a database error...

Default exception handler: Error writing to database Debug: ERROR: duplicate
key value violates unique constraint "mdl_formgridicon_sec_uix"
INSERT INTO
mdl_format_grid_icon (imagepath,courseid,sectionid) VALUES($1,$2,$3) RETURNING
id
[array (
'imagepath' => 'Cell.jpg',
'courseid' => '27591',
'sectionid' => '153780',
)]

Error code: dmlwriteexception

• line 410 of /lib/dml/moodle_database.php: dml_write_exception thrown
• line 244 of /lib/dml/pgsql_native_moodle_database.php: call to
  moodle_database->query_end()
• line 812 of /lib/dml/pgsql_native_moodle_database.php: call to pgsql_native_moodle_database->query_end()
• line 864 of /lib/dml/pgsql_native_moodle_database.php: call to
  pgsql_native_moodle_database->insert_record_raw()
• line 127 of /course/format/grid/backup/moodle2/restore_format_grid_plugin.class.php: call
  to pgsql_native_moodle_database->insert_record()
• line 131 of /backup/util/plan/restore_structure_step.class.php: call to
  restore_format_grid_plugin->process_gridsection()
• line 103 of /backup/util/helper/restore_structure_parser_processor.class.php: call to
  restore_structure_step->process()
• line 139 of
  /backup/util/xml/parser/processors/grouped_parser_processor.class.php: call to
  restore_structure_parser_processor->dispatch_chunk()
• line 91 of /backup/util/helper/restore_structure_parser_processor.class.php: call to
  grouped_parser_processor->postprocess_chunk()
• line 148 of /backup/util/xml/parser/processors/simplified_parser_processor.class.php: call
  to restore_structure_parser_processor->postprocess_chunk()
• line 92 of
  /backup/util/xml/parser/processors/progressive_parser_processor.class.php: call
  to simplified_parser_processor->process_chunk()
• line 169 of
  /backup/util/xml/parser/progressive_parser.class.php: call to
  progressive_parser_processor->receive_chunk()
• line 253 of
  /backup/util/xml/parser/progressive_parser.class.php: call to
  progressive_parser->publish()
• line ? of unknownfile: cal