I make sure to clear an existing texture before setting a new one in
case the user downloads a new file with the same path. Otherwise we'll
end up using a stale texture in the list.
Implements: #54 ("Convert the SideBar to use the Texture Cache")
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>
This widget allows users to change the displayed image by selecting a
new one from the filesystem.
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>