Please save tooltip sorting method and panel open/closed layout in a cookie so that I don't have to reset it every time I reload TensorBoard due to a UI glitch or memory leak.

When running TB with a lot of different runs, I always use Nearest for the tooltip sorting -- it makes it much easier to locate the particular run I'm interested in on a busy graph. However, every time I have to refresh the page, the sorting method reverts back to Default. I understand that the sorting method isn't in the url, since that tends to be a personal preference, but it does seem like quite a good idea to save the personal preference like most of the other things are saved.

In the same vein, if I have to reload TB (which is often the case because of memory use and UI glitches), it loses all of the open/closed states of the panels in each tab, and reverts back to having the top three panels open and the rest closed.

Thus, my user experience upon reloading is: close all of the panels that are open, hopefully before the graph loading pegs my cpu; set the tooltip sorting to Nearest, reopen the panels I had open before I reloaded. None of those steps would be necessary if these two pieces of state were saved in the cookie.

Start by locating the TensorBoard frontend code that manages tooltip sorting and each tab's panel open/closed state, then inspect how other personal preferences are persisted in cookies. Done means reloading the page preserves the selected tooltip sorting method and the panel layout instead of restoring defaults.