Webmail: configure 'mark message as read' timeout or option to completely disable this. #368
Description
Looks like the webmail interface automatically marks messages as read 500ms after opening them by calling FlagsAdd.
Looks like this is done in webmail.js https://github.com/mjl-/mox/blob/833a67fe3d3e9ab11725504ffe7adc447abe18a6/webmail/webmail.js#L4174C1-L4181
Would be nice if there was a config-option in the webmail settings to disable automatically marking seen mail as read. In my other mail-clients I have configuration to only mark as read on reply or when manually marking (m keybinding)