Window contents is greyed out when window is not focussed

[rrthomas]

What should happen:

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Like any other application displaying information, it's often useful to refer to it when it's not focussed. So, when I focus another window, the text etc. should not be greyed out.

What happened instead:

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When I click away from the Tootle window, its content is faded and harder to read.

How to reproduce:

1. Focus the Tootle window
2. Focus another window.

Build context:

• Distro: Ubuntu 20.04
• App version: 0.2.0
• Build type: As supplied with Ubuntu 20.04