Steps:
1. Create a build with HelloWorld in the build description
2. On the build history widget, search with HelloWorld

Expected Result:
Should return the build with "HelloWorld" in the description

Actual Result:
Doesn't return the correct build. It only works if you enter "helloworld", all lower case.

The issue is at core/src/main/java/jenkins/widgets/HistoryPageFilter.java, line 352

    private boolean fitsSearchString(Object data) {
        if (searchString == null) {
            return true;
        }

        if (data != null) {
            if (data instanceof Number) {
                return data.toString().equals(searchString);
            } else {
                return data.toString().toLowerCase().contains(searchString);
            }
        }

        return false;
    }

Here, the data is converted to lowercase, but the searchString, which is "HelloWorld" in this particular case, is not coverted. As a result, it's not returning the correct result.