Werk #15851: Combined graphs from views: Take view context into account

When rendering combined graphs from views via the dropdowns Hosts / Services > All metrics of same type in one graph, the context of the view was not taken into account. For example, views can be restricted to only include services whose descriptions match a regular expression. When rendering combined graphs from such a view, this restriction was not taken into account. Hence, the combined graph included more objects than the original view or even reported that the object limit for combined graphs was reached, even if the number of rows in the original view was below the limit.

Note that this error did not occur if additional filters were applied to the view before rendering the combined graph. In that case, the original context and the additional filters were correctly applied to the combined graph.

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