This is something I've been wondering for a while already but never had
time to ask.

When an editor-canvas% is set to transparent in its style list, and I
type in it, then the whole editor gets black and nothing can be seen.

Shouldn't it be gray, as the window background so it looks as if you
type directly on the window? 

For my purposes, I could set the background color directly
in a non-transparent editor-canvas%, but I see no platform-independent,
Racket-native way of obtaining the exact window background color. Do I
need to implement changes in the on-paint method? Is the black canvas
desired behavior?

[tested on Linux Mint 18.2 Cinnamon 64 bit, Cinnamon Version 3.2.7,
Radeon R9 280X graphics card]



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