Cole Robinson 1d7fcac3df viewers: simplify shared self._display handling
* Move shared init to `_set_display`
* Move per class init to `_init_display`
* Move per class signal setup to `_connect_display_signals`
* Make base class call cleanup of child class via `_close`
* Drop unnecessary spice `_display_channel` handle

Signed-off-by: Cole Robinson <crobinso@redhat.com>
2024-10-10 11:15:35 -04:00
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