do not return zero with minus-sign within range value, fixes #3221
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@ -78,6 +78,10 @@ void Range::set_val(double p_val) {
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if (p_val<shared->min)
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p_val=shared->min;
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//avoid to set -0
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if (p_val == 0)
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p_val = 0;
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if (shared->val==p_val)
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return;
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