strip trailing whitespace from most source files * NEWS, etc/NEWS.3, libgui/graphics/Backend.h, libgui/graphics/ButtonControl.h, libgui/graphics/EditControl.cc, libgui/graphics/Object.h, libgui/graphics/QtHandlesUtils.cc, libgui/graphics/ToolBarButton.h, libgui/graphics/__init_qt__.cc, libgui/graphics/gl-select.cc, libgui/qterminal/libqterminal/unix/TerminalView.cpp, libgui/qterminal/libqterminal/unix/TerminalView.h, libgui/qterminal/libqterminal/win32/QWinTerminalImpl.cpp, libgui/src/m-editor/file-editor-tab.cc, libgui/src/m-editor/file-editor.cc, libgui/src/m-editor/file-editor.h, libgui/src/m-editor/octave-qscintilla.cc, libgui/src/settings-dialog.cc, libgui/src/shortcut-manager.cc, libgui/src/workspace-view.cc, libinterp/corefcn/graphics.cc, libinterp/corefcn/input.cc, libinterp/parse-tree/pt-unop.cc, liboctave/array/dSparse.h, scripts/pkg/pkg.m, scripts/polynomial/polyeig.m, test/io.tst: Strip trailing whitespace.

%!test
%! unwind_protect
%!   addpath dir1;
%!   [d1_r, d1_f1, d1_f2, d1_f3] = func1 (0);
%!   addpath dir2;
%!   [d2_r, d2_f1, d2_f2, d2_f3] = func1 (0);
%!   assert (d1_r, 0);
%!   assert (d2_r, 1);
%!   assert (d1_f1, "dir1/func1");
%!   assert (d1_f2, "dir1/func2");
%!   assert (d1_f3, "dir1/func3");
%!   assert (d2_f1, "dir2/func1");
%!   assert (d2_f2, "dir2/func2");
%!   assert (d2_f3, "dir2/func3");
%! unwind_protect_cleanup
%!   rmpath dir1;
%!   rmpath dir2;
%! end_unwind_protect