This small commit fixes a problem with the predictive input frames,
which in some cases did not display the entire subset of matching items.
M src/edu/rice/cs/drjava/ui/MainFrame.java
M src/edu/rice/cs/drjava/ui/predictive/PredictiveInputModelTest.java
M src/edu/rice/cs/drjava/ui/predictive/PredictiveInputFrame.java