Allow hiding elements from SVG image on slide basis.

[dextras]

Allow hiding elements (single objects, groups of objects or selection) from SVG image on slide basis.

Why: sometimes some objects get into your slide although you would like to get rid of them. It is not possible to do it by simple dragging the camera to a different position. Currently the workaround is to place the object on some other layer and then hide the layer from the current slide but it seems to be a little bit troublesome.

My proposal regarding the workflow for hiding the objects from slide(s):

1. Select slide(s)
2. With mouse select an object in the current view in a similar fashion it is done in inkscape:

• Left Mouse Button (LMB) - select group(higher priority) or single elements, depending what is selected
• CTR + LMB - select single element, even if the element belongs to a group
• SHIFT + LMB - add to selection/remove from selection.
• CTR + SHIFT + LMB - add single element to selection/remove from selection .

3. click the button "hide object(s)" in order to hide the objects from the curent view.

To unhide objects: click the button "unhide object(s)".

[JonWel]

A first step in that direction that may be easyer to implement would be a selection of the object by name. The selection mechanism is already present in Sozi and hiding object mechanism too (can be done with frame and path). The changes would be to have that hiding linked to a slide instead of the whole presentation, and adding a field where we could list object's names to be hidden in this slide.

This could allow some kind of simple animations with two slides on the same position, but the object only present in the second slide.