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treeview: Avoid unnecessary event processing

Michael Weghorn requested to merge michaelweghorn/accerciser:michaelweghorn/limit_event_processing into master

AccessibleTreeview#selectNodeAtPath lets the GLib main loop process events to ensure that the tree has been populated before before selecting the node, added in

commit a092dc933985fafd5b1e2cc3374c7bbc0fb2d12e
Author: Michael Weghorn <m.weghorn@posteo.de>
Date:   Thu Jul 14 09:38:57 2022 +0200

    treeview: Populate path for bookmark right away

While experimenting with the "Inspect under mouse" feature with Gtk 4 apps (where that feature doesn't work yet), the feature would sometimes stop working altogether, also for other apps where it works in general. And Accerciser would not terminate properly any more when closed, but had to be killed.

For some reason, it was still processing events here.

No longer process events until none are left, but only until populating the tree is finished, which is what is of interest.

To do so, add a new class member isPopulating to keep track of whether the tree is currently being populated.

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