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Tab closing fixes

Alice Mikhaylenko requested to merge wip/exalm/tab-fix into master

The latter has a way to get EphyTabView from it; if EphyTabView is disposed first, we get a use-after-free.


It doesn't crash atm, but it does in wip/exalm/gtk4-overview as there are AdwTabButton and AdwTabOverview keeping extra refs -> AdwTabView outlifes EphyTabView and things explode when closing a window.


And 2 more fixes, this time for a crash reproducible with plain wip/exalm/gtk4 when closing the last tab in the window.

Edited by Alice Mikhaylenko

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