Tune search line highlight color

Ref: #462 (comment)

Author: walles

internal/styling.go

@@ -264,9 +264,9 @@ func configureHighlighting(terminalBackground *twin.Color, configureSearchHitLin
 	}
 
 	if plainBg != twin.ColorDefault && hitBg != twin.ColorDefault {
-		// We have two real colors. Mix them! I got to "0.2" by testing some
-		// numbers. 0.2 is visible but not too strong.
-		theme.searchHitLineBackground = ptr.To(plainBg.Mix(hitBg, 0.2))
+		// We have two real colors. Mix them! "0.15" comes from:
+		// https://github.com/walles/moor/issues/462#issuecomment-5652900991
+		theme.searchHitLineBackground = ptr.To(plainBg.Mix(hitBg, 0.15))
 
 		log.Trace("Search hit line background set to mixed color: ", *theme.searchHitLineBackground)
 	} else {