Use "while shown" instead of "while visible" in chooser functions,
since a desktop switch will make FLTK think the window is not visible
and prematurely return whatever file you have selected.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@1849 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Fl_HelpXYZ -> Fl_Help_XYZ
Fl_File_Chooser now supports directory choosing.
Added fl_dir_chooser() function.
Now set FLTK_DOCDIR env var in test/demo.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@1612 ea41ed52-d2ee-0310-a9c1-e6b18d33e121