Comment 8 for bug 1852899

mmmhh, I don't really understand why. However this patch should be used with a recent commit, because it uses this patch, that has been committed : https://bugs.launchpad.net/kicad/+bug/1844982. (But it seems that you are already using it). I basically added an extra rule based on this patch.

I litteraly just git-cloned the project (e6346c7408e368e95b25e69a4ed08ad951f4a78d) and made it : via netnames are not darkened properly

I add this only line (that is already in the proposed patch), and the via netnames are darkened properly :

diff --git a/pcbnew/pcb_painter.cpp b/pcbnew/pcb_painter.cpp
index 61b27eeec..3b08751c2 100644
--- a/pcbnew/pcb_painter.cpp
+++ b/pcbnew/pcb_painter.cpp
@@ -256,6 +256,7 @@ const COLOR4D& PCB_RENDER_SETTINGS::GetColor( const VIEW_ITEM* aItem, int aLayer
         // For vias, some layers depend on other layers in high contrast mode
         if( m_hiContrastEnabled && item->Type() == PCB_VIA_T &&
                 ( aLayer == LAYER_VIAS_HOLES ||
+ aLayer == LAYER_VIAS_NETNAMES ||
                   aLayer == LAYER_VIA_THROUGH ||
                   aLayer == LAYER_VIA_MICROVIA ||
                   aLayer == LAYER_VIA_BBLIND ) )