Gtk: Fix DateTimePicker dropdown in dialog #1856
Merged
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Fixes issues with DateTimePicker on Gtk platform when used in a Dialog.
In Gtk, calling Close() or Destroy() on the popup window didn't actually hide it while a Dialog is shown, so we call Hide() first. Also fixed some issues to remove the event handlers after the dialog is closed, and to ensure that the popup is usable.
Fixes #1818
Fixes #1816