FilterBuilder operator "is one of" adds extra spaces between values

When using an operator that takes a list of values like "is one of" and you enter a list of items, if the value field has focus when you click filter, a space is always added in between the values even if a space already exists.

Reproducible in the showcase via: http://www.smartclient.com/smartgwt/showcase/#grid_custom_filter_builder

Attached screen shots shows extra spaces between values just by having focus in the values and clicking "Filter"

For example, select operator "is one of" and put values "a,b,c" and hit Filter. Then do this repeatedly -click in value to get focus, -click Filter and watch the extra spaces get added over and over.

Attached Images

	screenshot_199.png (23.4 KB)
	screenshot_200.png (22.7 KB)
	screenshot_201.png (23.1 KB)
	screenshot_202.png (22.8 KB)