I was hoping to make 1.4.0 the next full release but there's still some outstanding bugs so 1.4.0 is coming out as a prerelease :-/

Breaking changes

Windows uses upgrading from 1.3.6 earlier will need to uninstall WMail before upgrading. Not doing this will result in two WMail installs

Changes

Here's what's made it into the release...

Fixed file upload button styles
Added Latvian dictionary
Updated electron & React
Download notifications now open the file when selecting
Downloads now download to a temporary file before completion
Downloads now add the file extension even if the user omits it
Update check always happens daily now. Option to disable this
Make WMail respond to --hidden command whilst running
Refactored the webview injection code to be more modular and extensible
Removed multiple instances of dom thrashing in the webview injection code. This should speed up start times
Updated some deprecated electron functions
Changed Tray menu to have submenus for each mailbox
Tray icon now tries to detect OS theme
Update cookie persistence code to make it more efficient, thanks to some added electron features