tests/testtreecolumns.c quit the main loop when the window is destroyed.

tests/testtreecolumns.c quit the main loop when the window is destroyed.

2002-04-26  Sven Neumann  <sven@gimp.org>

        * tests/testtreecolumns.c
        * tests/testtreeview.c: quit the main loop when the window is
        destroyed. Removed compiler warnings about wrong format in printf().