Do not refresh project list if filter did not change

Every time key up event is raised in the project list filter text box,
the project list was getting refreshed even if the filter did not
change (e.g. moving the cursor was refreshing the list).

Only call the refresh if the filter changed or if enter key is pressed.

Change-Id: I2e608d89e16dbef0cfe1e503ac2feb4639c27f5d
1 file changed