The underlying integer type for enums are implementation defined and may
not be the same size as gint/guint. So implicitly casting from pointers-
to-enum-types to pointers-to-int-types is unsafe. MSVC warns on these.
https://bugzilla.gnome.org/show_bug.cgi?id=774641
ges-validate.c:237:22: error: implicit conversion from enumeration type
'GESEdge' to different enumeration type 'GESEditMode'
[-Werror,-Wenum-conversion]
GESEditMode edge = GES_EDGE_NONE;
~~~~ ^~~~~~~~~~~~~
ges-validate.c:277:41: error: implicit conversion from enumeration type
'GESEditMode' to different enumeration type 'GESEdge'
[-Werror,-Wenum-conversion]
new_layer_priority, mode, edge, position))) {
^~~~
https://bugzilla.gnome.org/show_bug.cgi?id=759758
And add the new element to the same layer as the last clip that
was added, insted of adding to the last layer of the timeline
(and with the current code, actually adding a new layer each time)
