Fixes #17297.  Changed relative mouse position to absolute, and added automated RangeSlider tests.
Refs #17093. Use cross-browser String.indexOf() instead of String.startsWith()
Fixes #17103 which has two problems, one is that the checkbox is not displayed in the drop-down, and the second problem is that the initial ComboBox label is not displayed, both are fixed in dojox/form/CheckedMultiSelect.js. Also update the dojox/mvc test related to the change which caused part of this problem to be sure to avoid breaking dojox/mvc.
fixes #17298. Make sure tooltip on pie are correctly displayed even in case of negative value slices.