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Devel docs: Mention mid-end background clearing

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Ben Harris
2022-12-06 13:06:36 +00:00
parent 9afdd4cca4
commit 3e072dff91
1 changed files with 3 additions and 1 deletions
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@ -1438,7 +1438,9 @@ The very first time this function is called for a new
area. Since this often involves drawing visual furniture which is
never subsequently altered, it is often simplest to arrange this by
having a special \q{first time} flag in the draw state, and
resetting it after the first redraw.
resetting it after the first redraw. This function can assume that
the mid-end has filled the drawing area with colour 0 before the first
call.
When this function (or any subfunction) calls the drawing API, it is
expected to pass colour indices which were previously defined by the