Fix errors and bugs

remove yield

try colorbuffer() to fix test error

try fixing line AA scaling

GLMakie/src/drawing_primitives.jl

@@ -341,10 +341,10 @@ function draw_atomic(screen::Screen, scene::Scene, @nospecialize(x::LineSegments
         if haskey(data, :intensity)
             data[:color] = pop!(data, :intensity)
         end
-
         # Tweak things for px_per_unit
         resolution = pop!(data, :resolution)
         data[:resolution] = map((ppu, res) -> ppu .* res, px_per_unit, resolution)
+
         return draw_linesegments(screen, positions, data)
     end
 end

GLMakie/test/unit_tests.jl

@@ -306,6 +306,7 @@ end
 
     # decrease the scale factor after-the-fact
     screen.scalefactor[] = 1
+    GLMakie.Makie.colorbuffer(screen)
     @test GLMakie.window_size(screen.glscreen) == scaled(screen, (W, H))
 
     # save images of different resolutions