The Grease Pencil Material Popover currently has a color picker for the Stroke of a Material using Solid style, but not one for a Fill using Solid style. With the default Grease Pencil Materials, the current popover only shows the Stroke color for the grey "Solid Fill" material (which doesn't have its Stroke enabled) instead of the more useful Fill color. This patch shows a Stroke color picker when the Material has Stroke enabled and the style is Solid. This is the same for the Fill. Reviewed By: antoniov, mendio Differential Revision: https://developer.blender.org/D17004