This limits duplicate cursor invalidation removal to same
view only, which seems to have been left in error.

We should now remove any old cursor invalidations (for
the same view) and only keep the latest (current) one.

Change-Id: Ie2323d0c5fcf3977576a1bdc098c95351a5753e0
Reviewed-on: https://gerrit.libreoffice.org/71846Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>