Hi all!

While playing with colors for pairtaghighlighter plugin, I saw that Scintilla is using BGR instead of normal RGB. I found existing code in Geany source to use it in my plugin.

utils_invert_color from utils.c deals with replacing blue with red, but with mistake.

Below are results of my testing with random color:
11111111 11001100 10011001 - input color
10011001 11001100 11111111 - result of my function (rgb2bgr)
00000000 00110011 01100110 - result of utils_invert_color

A little source file is attached.
If it is really mistake (maybe I don't know something), I will do commit and pull request.

Any comments about this?

Best regards,
Volodymyr Kononenko