Dimithrandir

### Describe the bug The active tab is not connected to the window. There is a 1px line between the tab and the rest of the window. ### Expected behavior...

Feature: Add access keys/hotkeys/mnemonics for context menu

2

This is a reinstalment of the feature first introduced in #55, which was removed in #70. It adds an access key (a.k.a. hotkey or mnemonic) to the context menu items...