When browsing reported site (https://minecraft.curseforge.com/), user that uses Android cannot set caret on some editable contents.
GV's IME code uses `NOTIFY_IME_OF_SELECTION_CHANGE` to update selection on native IME. But GV doesn't receives this notification on this reported site. This notification is fired by editor's selection listener, but when this occurs, this notification is no logner fired unfortunately. Because selection listener isn't registered by current selection.
At first, editor registers selection listener by `EditorBase::Init`. But like test case, if PresShell is destroyed after editor is created, this registration is no longer used, and we have to register it by new selection again. So we should tear down editor when PresShell is destroyed. (or we have to add a way to re-initialize selection listener?)
This isn't related to Android. Android's IME code depends on this notification, so this occurs easily.
Also, `PresShell::SetCaretEnabled` only works when caret is valid (`PresShell::GetCaret` has caret). If caret is nothing, it hits assertion.
And, attached test case is reproduced sample.
Differential Revision: https://phabricator.services.mozilla.com/D41356
--HG--
extra : moz-landing-system : lando
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