Make non-focused windows less prominent

[Gael]

When I work with multiple Affinity apps I regularly click on the tools from the wrong app.
Please add differentiated visual states for foremost and background windows (in a more obvious way than currently implemented).

The good news is that you already have it coded! The UI state for "no open file" would suffice I think (see second image). It would even work with monochrome icons.

fig.1: current implementation

fig.2: proposed implementation with greyed-out UI 

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It's a "pebble in the shoe" kind of of problem, it gets worse the more you use Affinity