Pressing Ctrl+Shif+F
with a text selected will search the selected text only if the Search tab on the left bar is already open.
If another tab is open, pressing Ctrl+Shif+F
will open the Search tab and will ignore the selected text.
(This has bothered me for a long time. I wasn’t able to figure out why sometimes it would use the selected text and sometimes it wouldn’t. I finally understand. Feels good.)