instead of clearing the search list when we delete, build a small part of it by searching through a small part that is likely to be visible on the user's screen, which gets rid of flickering effect and makes it look like the search list is not rebuilt from scratch

fcore/search-list.sml

@@ -159,6 +159,7 @@ struct
 
   fun searchRange (buffer: LineGap.t, searchString, low) =
     let
+      val low = Int.max (low, 0)
       val {rightStrings, leftStrings, idx = absIdx, ...} = buffer
     in
       case rightStrings of