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clutter/actor: Get next action from list before handling current action

Sebastian Keller requested to merge skeller/mutter:fix-search-clear-crash-43 into gnome-43

Handling the current action might end up removing the current element from the list, which would result in an invalid read when trying to get the next element. Before glib 2.76 this was covered up by the use of the slice allocator, but now this leads to a crash.

This was happening with the click action on the clear icon in the shell search entry, which when clicked results in the clear icon being removed along with the corresponding action.

Closes: gnome-shell#6552 (closed)

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