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EXPLAIN links should be disabled whith no SQL in selected process #738
Steps to reproduce this issue
If only the process is selected, the button will become available, causing an error if the EXPLAIN is clicked in this case.
When there is no SQL to analyze, the button is unavailable or more friendly. Avoid errors.
The available state of the button changes depending on whether a valid SQL is selected, or when the button is clicked, the judgment is made first, and the prompt is not analyzed. I prefer the previous one.