Fix the vertical scaling when hiding comparisons in the new chart UI.
- Go to an advanced chart for a stock.
- Add a stock as a comparison, but make sure the second stock has a wider vertical range (e.g. show $PG, and use $NVDA as a comparison).
- Hide the second stock.
The vertical scaling of the chart acts as if the second stock is still visible. As a result, the chart is no longer as useful because the scaling is weird.
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