Adjust tab order in find/replace dialog

[JasonWeill]

I would add, while on the subject of improving the search function, that the Tab order for find/replace should really be adjusted. Currently, if you put your cursor in the find field, type something to find, then hit tab (to type its replacement) it moves the selection to the next button (which is "match case"). Compare this to any other program with find/replace: tab key will always first send the cursor to the replace field, then to highlight any subsequent buttons.

Originally posted by @gaulinmp in jupyter/notebook#7458 (comment)