Line Rendering - "occLineWidth" not set in rasterised shader

Hi,

We are building a product with Visualisation that relies on line rendering with variable widths.

Recently, we changed the windowing framework for our Viewport. Everything worked as expected, except lines are now only 1px thick everywhere, despite changing the Prs3d_LineAspect width.

After some investigation, we suspected that this is due to OpenCASCADE code that still uses the fixed function pipeline to set line width, despite there existing a new shader uniform named occLineWidth to address this;

Graphic3d_ShaderManager.cxx:207

EOL"  float aMixVal = smoothstep (occLineWidth - occLineFeather * 0.5, occLineWidth + occLineFeather * 0.5, aDistance);"

OpenGL_Context.cxx:2508

if (myGapi == Aspect_GraphicsLibrary_OpenGLES
 || core11ffp != NULL)
{
  // glLineWidth() is still defined within Core Profile, but has no effect with values != 1.0f
  core11fwd->glLineWidth (theWidth * myLineWidthScale);
}

When changing our OpenGL context to use the Compatibility profile, the line rendering returns to the old, desired behavior. Is it intended for line width to affect rendering when using the Core profile of OpenGL? Are we misusing the visualisation API? Is code similar to the below needed somewhere?

auto shaderLoc = ActiveProgram()->GetStateLocation(OpenGl_OCCT_LINE_WIDTH);
ActiveProgram()->SetUniform(glContext, shaderLoc, theWidth * myLineWidthScale);

Thanks