text annotations with with hrefs containing encoded characters such as '#' break links

The solution that was adopted in #2471 to enable support for encoded hrefs seems to break for characters like # and :. This seems to be because JavaScript's encodeURI and decodeURI do not encode/decode these characters. Perhaps more nuanced used of encodeURIComponent and decodeURIComponent needs to be used?

Here's a minimal working example in Python, which is trying to link to a Twitter query for #food lang:en, in which the # and : characters need to be encoded:

import plotly.io as pio
fig = {"data": [{"type": "bar", "x": ['<a href="http://twitter.com/search? q=%23food%20lang%3Aen">query</a>'], "y": [1]}]}
pio.show(fig)

The generated link ends up being scrambled because the hash and colon escape sequences are not decoded, but are then encoded again, resulting in the following Twitter search: %23food lang%3Aen

まず issue #2471 で採用されたアプローチを確認し、最小限の Python 例を Plotly グラフで再現します。href に対する JavaScript の encodeURI/decodeURI の処理を追跡し、エンコードされた # と : の文字がそのまま保持され、Twitter のクエリが正しく開くことを確認します。