Full screen chart can't compare symbols
The comparison feature in Yahoo Finance charts is broken. You can't bring up new tickers to compare.
Steps to reproduce this bug:
1. Open a chart. Ex: https://finance.yahoo.com/quote/MDY
2. Click on "+ Comparison".
3. Type a ticker symbol in the box labeled "search symbols or companies" and <Enter>. For example ISHG <Enter>.
Result: "Invalid input".
Tested in the latest Firefox and Chrome.
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