Zion Huang

Thanks for the fix! I added this because of #881 (0e358d5f0c8a6c56a3d8a42baa09543bd23b7a70), but it turns out that `savedStateHandle` automatically decodes url for me. Therefore, `decode` is unnecessary.

However, I noticed that spaces are converted to `+`. In @Malopieds 's version, if I type `+` in the search bar and submit, `+` becomes space. It's strange that `savedStateHandle`...

Found a solution: use base64 encoding.