Partially correct tick icon not displayed for MULTICHOICE, single answer questions.
IF a MULTICHOICE (single answer) question has, besides one 100% graded correct answer, one or more questions graded less than 100%, then if one of those is selected by the student, the quiz correctly displays a "Partially correct" feedback message but wrongly displays a correct tick icon (tick_green_big.gif) rather than the expected partially correct orange tick icon (tick_amber_big.gif).
On the other hand, the behavior is as expected for a MULTICHOICE multianswer question.

I am attaching the patch against current moodle 1.8 question/type/multichoice/questiontype.php file.

1. 1. 1. Eclipse Workspace Patch 1.0
         #P moodle18dev
         Index: question/type/multichoice/questiontype.php
         ===================================================================
         RCS file: /cvsroot/moodle/moodle/question/type/multichoice/questiontype.php,v
         retrieving revision 1.16.2.7
         diff -u -r1.16.2.7 questiontype.php
      • question/type/multichoice/questiontype.php 10 Aug 2007 15:21:17 -0000 1.16.2.7
        +++ question/type/multichoice/questiontype.php 31 Dec 2007 15:22:47 -0000
        @@ -312,7 +312,11 @@
        $a->class = question_get_feedback_class(1);
        }
        if (($options->feedback && $chosen) || $options->correct_responses) {

• $a->feedbackimg = question_get_feedback_image($answer->fraction > 0 ? 1 : 0, $chosen && $options->feedback);
  + if ($type == ' type="checkbox" ') { + $a->feedbackimg = question_get_feedback_image($answer->fraction > 0 ? 1 : 0, $chosen && $options->feedback); + }

  else

  { + $a->feedbackimg = question_get_feedback_image($answer->fraction); + }

  }

// Print the answer text
Joseph