Move selection-only preview to refresh function

Martin Owensrequested to merge
doctormo/inkscape:fix-3638-crash-on-upgroup into master

When the drawing items are mutated during a modification event cycle, there is the possibility that the drawing item hierarchy is not consistent and will crash.

Also fixes lack of updates on selectionModified.

Fixes #3638 (closed) Fixes #3582 (closed)

Edited by Martin Owens

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