Add commandline conversion for Windows (no-op on other platforms)

- add Fl::args_to_utf8() to convert commandline arguments to UTF-8

This new function closes the gap that previously only Visual Studio
applications converted their commandlines to UTF-8.

Tested with MinGW, MSYS2/MinGW-w64, and Visual Studio (2019).

1 files changed, 3 insertions, 0 deletions

diff --git a/FL/Fl.H b/FL/Fl.H
index b52c33c72..3757b65be 100644
--- a/FL/Fl.H
+++ b/FL/Fl.H
@@ -1398,6 +1398,9 @@ public:
 
   static int system(const char *command);
 
+  // Convert Windows commandline arguments to UTF-8 (documented in src/Fl.cxx)
+  static int args_to_utf8(int argc, char ** &argv);
+
 #ifdef FLTK_HAVE_CAIRO
   /** \defgroup group_cairo Cairo Support Functions and Classes
       @{