Group identically-scoped buttons on Toolbar
Right now Ark's viewer window toolbar contains buttons with different scopes: some operate on the full contents of the view, while others operate on the set of selected items. The ones with a selection-scope correctly disable themselves when nothing is selected, which is good. However they are not grouped together; instead they are intermixed with the global-scope actions. This is slightly confusing.
This commit fixes that by grouping the global-scope actions and the selection-scope actions together, and separates the groups with a separator.
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