Add panel to display the search results

[valuex]

Is your feature request related to a problem? Please describe. no.

Describe the solution you'd like In PDF-XChange, there is a panel to display the search results.
It is very convinent for user to read scholar paper or patent pdf files, so that he or she can know what the number stands for.
There is no need for switching back and forth.

Also, a more advanced one would be like, when the mouse hovers over the result item, there would be a pop-up window showing the content around that area. I do expect it becomes a thrilling feature of SumatraPDF. 👍 😊