ohw, so, u mean that the editor is not a GTK widget?
Scintilla is a GTK widget, in that it fits into the GTK UI infrastructure, but its not part of the GTK project.
Scintilla is a standalone project that provides an editing UI element, originally a native Windows control, but now also a GTK widget and a native Macos UI element. So its not just a GTK widget, and its not part of the Geany project, and it is used by many other editor/IDE projects, so it treads its own path on what it supports.
But Geany uses GTK on all platforms, so uses Scintilla as a GTK widget on all platforms.
lol i clearly said at 2-3 places that they are working fine
Its good that you are lucky, but other people observe issues with how well/not well GTK fits into Windows (and Macos).