Norman Feske 4e711d4738 gui_session: split alloc_view_handle, view_handle
Express the allocation of a new view handle by a dedicated RPC function
instead of passing an invalid view handle to the existing 'view_handle'
function.

This eliminates the notion of invalid view handles at the GUI session
interface, clearing the way for managing view handles via an Id_space.

Issue #5242
2024-08-27 15:29:38 +02:00
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