System console is configured at DRAW start to use UTF-8 encoding, for cout and cin to deal correctly with Unicode symbols.
Use of std::wcout is avoided as it leads to corrupted output.
Command testgrid is improved to enforce UTF-8 encoding in child DRAW processes to preserve Unicode symbols in captured output.
Test bugs fclasses bug22125 is refactored:
- avoid dependency on external data file
- avoid producing snapshot
- check that Unicode name of the file created by OCCT procedure matches the name interpreted by Tcl functions
OSD_OpenStream() now uses __gnu_cxx::stdio_filebuf extension for opening UNICODE files on MinGW when using C++ file streams.
Variant accepting filebuf returns bool (true if succeeded and false otherwise).
Checks of ofstream to be opened made via calls to low-level ofstream::rdbuf() are replaced by calls to ofstream::is_open(); state of the stream is also checked (to be good).
Unicode name used for test file in test bugs fclasses bug22125 is described (for possibility to check it).
