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Resolves out-of-bounds initial condition whenever this loop began with start_line = 2047.
This, I believe, was the remaining cause of screen flashes.
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@ -576,7 +576,7 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
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// Divide spans by which frame they're in.
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uint16_t start_line = read_pointers.line;
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while(new_lines) {
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uint16_t end_line = start_line+1;
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uint16_t end_line = (start_line + 1) % LineBufferHeight;
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// Find the limit of spans to draw in this cycle.
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size_t lines = 1;
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