Closed Issue: MaskedEditExtender: Using '?' in a mask with ClearMaskOnLostFocus=False [11485]

When a textbox with '?' in a mask and ClearMaskOnLostFocus=False gains focus the mask is reapplied when it shouldn't be.

For example, if the textbox has a mask like ????-???? and the value of the textbox is 1234-ABCD, when the textbox gains focus it will get a new value of 1234--ABC.
Comments: Workaround found, see comments.