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Index: moodle/grade/report/grader/styles.php
--- moodle/grade/report/grader/styles.php Base (1.1.2.18)
+++ moodle/grade/report/grader/styles.php Locally Modified (Based On 1.1.2.18)
@@ -391,7 +391,8 @@
 .grade-report-grader .right_scroller {
 width:auto;
 clear:none;
-overflow-x:auto;
+overflow-x:scroll;/* force horizontal scrollbar to appear MDL-21088 */
+overflow-y:hidden;
 }
 
 .grade-report-grader table tr.avg,.grade-report-grader table tr.groupavg td,.grade-report-grader table tr.avg td,.grade-report-grader table tr.groupavg th,.grade-report-grader table tr.avg th,.grade-report-grader table tr.controls_row,.grade-report-grader table tr.controls_row th,.grade-report-grader table tr.range_row,.grade-report-grader table tr.range_row th,div.right_scroller tr {