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Fix: Crash when extra viewport height is zero with sign in view. (#9175)
If a viewport sign straddles the top of a viewport, a crash will occur if the viewport height is zero. This is resolved by simply not attempting to draw the viewport in this situation, consistent with other widgets.
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@ -1913,6 +1913,8 @@ void NWidgetViewport::SetupSmallestSize(Window *w, bool init_array)
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void NWidgetViewport::Draw(const Window *w)
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{
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if (this->current_x == 0 || this->current_y == 0) return;
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if (this->disp_flags & ND_NO_TRANSPARENCY) {
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TransparencyOptionBits to_backup = _transparency_opt;
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_transparency_opt &= (1 << TO_SIGNS) | (1 << TO_LOADING); // Disable all transparency, except textual stuff
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