Well - I've had another look at this problem, "blending" Greg's test
program with my test program...

It seems there is something awry in out UTF-8 decoding, at least on
WinXP - see attached PNG (assuming it is attached!)

In particular, points to note are:

1) The main area shows the same string rendered twice, first in an
Fl_Box (from Greg's example) and then in an Fl_Input (from my example.)

Note that string 3 has *all* the glyphs correctly rendered in the
Fl_Input case (this is what I had seen in my earlier tests) but has one
glyph incorrectly interpreted by the Fl_Box view.

Both boxes have the same input string, same font, etc. so this seems
very odd. I did not think we interpreted the string any differently
between the two, but clearly we do!


2) The "submenu" line at the top of the screen shows the same missed
glyph as the Fl_Box example.


3) The window label is rubbish - clearly this is treating the window
label as ASCII or something...


Testing on WinXP with fltk-1.3 from svn, built with mingw.


Note that I'm not seeing the "variable" behaviour that the OP reports, I
see the same pattern on every run.
-- 
Ian




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