I have actually traced the source of the problem. It happens because Geany and the GtkColorSelection take the same underlying GdkColor (0..65535 resolution) and use different algorithms to convert it to #RRGGBB (0..255 resolution), resulting in a slight discrepancy between what’s shown in the dialog and what’s inserted into the document.

This can be fixed by switching the two lines in utils_scale_round and invoking it like utils_scale_round(... / 65535.0, 255). This gives me consistently the same result between Geany and GTK+. (See also gtk/gtkcolorsel.c, function scale_round.)

The only question, then, is why was the correct line in utils_scale_round commented out and replaced with a less correct one. But this happened before the initial Git import, so probably nobody knows anymore.

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