Allow palettes to be displayed with a fixed number of columns, automatically sizing the colour swatches to fit and respect the columns count stored in GPL palette files.
Larger colour palettes are often laid out as multiple fixed size ramps. One can resize the sidebar to get the palette laid out in the desired number of columns but if one switches to a palette with a different column layout they must manually resize the sidebar to achieve the desired layout.
Likewise with tilesets. With the both palette and tileset shown simultaneously one cannot independently size the palette and tileset so the same option should also be available for the tileset view control.