threerings/papercut — comment on commit eadd6701c6410fb67a944293af10ebe06347a982
File:  line 0
By groves:

This means if you enter a value larger than 999 in the field, it shrinks the slider. The max text restriction prevented that. I like max text as it doesn't change what the user's inputting as they're typing, but validating the entry and changing what the user entered to fit could work with this approach.