Mailspring: Bug: Timezone handling for event invites is incorrect

[liam-wiltshire]

Describe the bug
When you receive an event invite, the time displayed is in the _senders_ local time, but the timezone displayed is the _received_ timezone.

For example, if I, as the sender am in Bulgaria (EEST (UTC+3)), and I send an invite for an event at 4pm EEST to a recipient in the UK (BST (UTC+1)), the recipient should see the invite time as 2pm BST. However instead it displays 4pm BST (the senders time, but with BST as the timezone).

Have logged into GMail and confirmed that, in GMail, the correct time is displayed (2pm BST):

To Reproduce
Steps to reproduce the behavior:

1. Send an invite (likely _not_ by using Mailspring) from one timezone (e.g. EST)
2. Receive the invite via Mailspring with your setup to use a different timezone from the original invite (e.g. PST)
3. See the time as being the invite time from the sender, but suffixed with your local timezone.

Expected behavior
Either a) The time should be shown using the senders time _and_ timezone (not ideal), or the time should be showng and converted to your timezone (preferable).

Screenshots
See above

Setup: (please complete the following information):

• OS: Fedora
• OS Fedora release 28 (Twenty Eight)
• Mailspring Version: 1.7.6

Additional context
Have only tested _receiving_ invites into a GSuite/GMail account - haven't tested sending them, or seeing if the same issue exists when receiving invites through other mail providers, although I cannot see why it wouldn't.

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[tecoholic]

More confirmation

[3v1n0]

Damn it, this made me wake me up early in the morning for an event happening way later!