Vector layers are almost impossible to overlay upon

[jidanni]

Vector layers are either active or inactive. If inactive then they are
very dim. No fiddling with their opacity well help much.

But there's the conflict: a vector layer must be made inactive so we can
manipulate the overlay.

But we can hardly see the vector layer we are trying to overlay on.

Yes sometimes one wants to overlay on a vector layer and doesn't always
have imagery available to overlay upon instead.

Build-Name:Debian
Build-Date:2017-12-31 19:46:08
Revision:13265
Is-Local-Build:false
Debian-Release:0.0.svn13265+dfsg-1
Identification: JOSM/1.5 (13265 Debian en) Linux Debian GNU/Linux buster/sid

[jidanni]

So dim!

[jidanni]

OK one must convert the Data Layer to a GPX layer to still see it.

(There is a fundamental flaw in the display of vector layers vs. raster.

With raster layers one can always adjust the opacity from 0 to 100%.

But with vector layers there is no such concept. The opacity (or shall
we call it brightness) is either 1) around 10 or, 2) 100 percent.

True, the usual case is layering one vector layer upon another,
whereupon the current behavior makes sense.)

[Klumbumbus]

Inactive data layers are displayed grayscale to not confuse the user with editable and non editable data.

If you wish you can set the value of draw.data.inactive_color in the advanced preferences to false to disable this behavior.