[Gtk] Fold margin formatting / Folding in the container

Hello everyone,

while trying to add some kind of folding support to my editor, I found that it
is relatively hard to get the fold margin correctly set up under Gtk. By
default, the folding symbols will be all circles (SC_MARK_CIRCLE) and what's
worse is that they are all black on white including the lines without any
markers. The margin type apparently has no influence on this, even though
SC_MARGIN_BACK/SC_MARGIN_FORE should somehow cause STYLE_DEFAULT to be
respected. Consequently, to configure the fold margin 2 for my color scheme and
two fold markers, I'd have to do something like:

SCI_SSETFOLDMARGINCOLOUR(1, BGCOLOR)
SCI_SSETFOLDMARGINHICOLOUR(1, BGCOLOR)

SCI_MARKERDEFINE(SC_MARKNUM_FOLDER, SC_MARK_CHARACTER+'+')
SCI_MARKERSETFORE(SC_MARKNUM_FOLDER, FGCOLOR)
SCI_MARKERSETBACK(SC_MARKNUM_FOLDER, BGCOLOR)

SCI_MARKERDEFINE(SC_MARKNUM_FOLDEROPEN, SC_MARK_CHARACTER+'-')
SCI_MARKERSETFORE(SC_MARKNUM_FOLDEROPEN, FGCOLOR)
SCI_MARKERSETBACK(SC_MARKNUM_FOLDEROPEN, BGCOLOR)

SCI_SETMARGINMASKN(2, (1 << 30) | (1 << 31))

Is this the expected behavior?
The fold margin on Scinterm is not black-on-white and even has '+'/'-' markers
by default.

In a related matter: I found that I couldn't enable folding on a lexer I 
implemented in the container (ie. by hooking into SCN_STYLENEEDED 
notifications). It's not sufficient to just set the fold level on lines 
via SCI_SETFOLDLEVEL. There won't be any fold markers afterwards. I 
suspect, that it's not currently possible without implementing the ILexer5 
interface. If the problem is not on my side, I suggest that this should be 
fixed. It's not very convenient to wrap ILexer5 in some third language. 
Even in plain C, which is what I am using, this means to either add a C++ 
compilation unit and suddenly having to make practically all of my 
internal headers C++-compatible, or having to write a plain C API wrapper 
around ILexer5/IDocument with its dozens of functions. Also, I have "dumb" 
lexers written in my scripting language, that are supposed to style the 
document only once and it would be nice if I could let them also set the 
fold levels. Although, for them I could probably implement some dummy 
ILexer5 instance, which just makes sure that folding is enabled, since 
they don't actually have to respond to lexing and folding requests 
dynamically.

Best regards,
Robin

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