InactiveSliderTestPanel.py

import bpy


class HelloWorldPanel(bpy.types.Panel):
    bl_label = "Inactive Slider Artifacts"
    bl_idname = "SCENE_PT_inactive_slider"
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "scene"

    def draw(self, context):
        layout = self.layout

        row = layout.row()
        row.prop(context.scene.render, 'resolution_percentage', slider=True)

        row = layout.row()
        row.active = False
        row.prop(context.scene.render, 'resolution_percentage', slider=True)


def register():
    bpy.utils.register_class(HelloWorldPanel)


def unregister():
    bpy.utils.unregister_class(HelloWorldPanel)


if __name__ == "__main__":
    register()