BF: Setting xticks appeared to be changing xlim. Set xlim afterwards.

fsleyes_widgets/utils/colourbarbitmap.py

@@ -143,8 +143,6 @@ def colourBarBitmap(cmap,
               origin='lower',
               interpolation='nearest')
 
-    ax.set_xlim((0, ncols - 1))
-
     ax.set_yticks([])
     ax.tick_params(colors=textColour, labelsize=fontsize, length=0)
 
@@ -212,6 +210,8 @@ def colourBarBitmap(cmap,
         for l, a in zip(ticklabels, tickalign):
             l.set_horizontalalignment(a)
 
+    ax.set_xlim((0, ncols - 1))
+
     canvas.draw()
 
     buf = canvas.tostring_argb()