Prevent unwanted font face changes

When a non-standard character appears in the text, it was searched in
the spare faces of the font. Moreover, the default range also began to
be read from the spare face. I made that *only* characters that are not
in the default face are read from the spare face.

src/pigui/PiGui.cpp

@@ -122,16 +122,16 @@ Instance::Instance() :
 	// TODO: clang-format doesn't like list initializers inside function calls
 	// clang-format off
 	PiFont uiheading("orbiteer", {
+		PiFace("Orbiteer-Bold.ttf", 1.0), // imgui only supports 0xffff, not 0x10ffff
 		PiFace("DejaVuSans.ttf", /*18.0/20.0*/ 1.2),
-		PiFace("wqy-microhei.ttc", 1.0),
-		PiFace("Orbiteer-Bold.ttf", 1.0) // imgui only supports 0xffff, not 0x10ffff
+		PiFace("wqy-microhei.ttc", 1.0)
 	});
 	AddFontDefinition(uiheading);
 
 	PiFont guifont("pionillium", {
+		PiFace("PionilliumText22L-Medium.ttf", 1.0),
 		PiFace("DejaVuSans.ttf", 13.0 / 14.0),
-		PiFace("wqy-microhei.ttc", 1.0),
-		PiFace("PionilliumText22L-Medium.ttf", 1.0)
+		PiFace("wqy-microhei.ttc", 1.0)
 	});
 	AddFontDefinition(guifont);
 	// clang-format on
@@ -199,7 +199,8 @@ ImFont *Instance::AddFont(const std::string &name, int size)
 
 	PiFont &pifont = iter->second;
 	pifont.setPixelsize(size);
-	pifont.faces().back().addGlyph(0x20); // only add space
+	// only add space to the first face, this will be the default face, faces without ranges are not baked
+	pifont.faces()[0].addGlyph(0x20);
 	m_pi_fonts[std::make_pair(name, size)] = pifont;
 
 	m_should_bake_fonts = true;