Two trivial optimizations

1. Comment out re-calculation of parameters to adjust for the case when
the user changed screen orientation, because we force portrait mode on
document close. I left a comment explaining this, so we can uncomment
this code if we choose to not force portrait mode on document close in
thefuture.
2. Don't re-sort the list if the file does not exist.
This predicts the most likely scenario, namely that the user
will choose to delete this stale history entry.
And even if he chooses NOT to delete it, placing a stale entry
to the top of the list contradicts our logic because the
non-existent file was never opened.

filehistory.lua

@@ -230,18 +230,20 @@ function FileHistory:addAllCommands()
 			file_full_path = file_entry.dir .. "/" .. file_entry.name
 			if FileExists(file_full_path) then
 				openFile(file_full_path)
-				--reset height and item index if screen has been rotated
+				--[[
+				-- reset height and item index if screen has been rotated
+				-- not needed because we force portrait mode on document close
 				local item_no = self.perpage * (self.page - 1) + self.current
 				self.perpage = math.floor(G_height / self.spacing) - 2
 				self.current = item_no % self.perpage
 				self.page = math.floor(item_no / self.perpage) + 1
+				--]]
+				self:init()
+				self:setSearchResult(self.keywords)
 				self.pagedirty = true
 			else
 				InfoMessage:inform("File does not exist ", DINFO_DELAY, 1, MSG_ERROR)
 			end
-			self:init()
-			self:setSearchResult(self.keywords)
-			self.pagedirty = true
 		end
 	)
 	self.commands:add(KEY_DEL, nil, "Del",