I think that we can drop nsIMEUpdatePreference::DontNotifyChangesCausedByComposition(), i.e., nsIMEUpdatePreference::NOTIFY_CHANGES_CAUSED_BY_COMPOSITION because it's now used only by TSFTextStore but TSFTextStore ignores if SelectionChangeDataBase::mCausedByComposition or TextChangeDataBase::mCausedOnlyByComposition is true (for supporting async changes in e10s mode). So, only issue is, dropping the flag might cause increasing computing TextChangeData cost during composition in TSF mode. However, now, it's already enough fast and even if it'd cause performance regression, we could add a hack with TextComposition's offset information. Therefore, we don't need to worry about the performance regression so seriously.
MozReview-Commit-ID: HNT3G4isONj
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extra : rebase_source : 164231023aa2a17ceab94d92fb49ba0a00dab429
Currently, all widgets request selection change notifications to IMEContentObserver. Additionally, IMEContentObserver needs to listen selection changes for caching latest selection for eQuerySelectedText. Therefore, it doesn't make sense to keep defining nsIMEUpdatePreference::NOTIFY_SELECTION_CHANGE.
If widgets didn't need selection change notifications, they could just ignore the unnecessary notifications.
Note that all widgets don't need selection change notifications if a plugin has focus and IMEContentObserver cannot observe selection changes in the plugin. Therefore, if IMEContentObserver is initialized with a plugin, it shouldn't listen selection changes (and doesn't need to notify widgets of selection changes).
MozReview-Commit-ID: FOVFFgA2nOz
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extra : rebase_source : 3e16d5023835f99f82934e754d2e7db70474f9ee
For sending NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED after the other change notifications which was caused by the user input, we need to use IMEContentObserver::IMENotificationSender because it sends the notifications when it's safe to do it.
This patch makes TextComposition use IMEContentObserver to send the notification. However, if there is no active IMEContentObserver, e.g., composition events are fired on unfocused window, TextComposition sends it by itself (same as current implementation).
If IMEContentObserver stops observing when it has pending NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED, it cannot send the notification (i.e., it is discarded completely in such case). However, in such case, IMEContentObserver sends NOTIFY_IME_OF_BLUR. So, anyway, native IME handler should treat the blur notification as it including NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED.
On the other hand, we're buggy if composition events are fired in non-active window. Even in such case, IMEContentObserver should be created for active editor in each document and it notifies IME of the changes. But this is out of the scope of this bug.
MozReview-Commit-ID: 7Q0ZsJTh4hX
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extra : rebase_source : 6417f991fa8c0fbe3f25b27bacf4257e5485aecc
It's not clear to me what NOTIFY_IME_OF_COMPOSITION_UPDATE means only from the name. For making the name clearer, this patch renames it to NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED and add some explanation to the definition.
MozReview-Commit-ID: 8ySYCNJ1Ytz
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extra : rebase_source : 3331b8f48e8b460c7f9b088064dcda9488f3403c
PuppetWidget::GetInputContext() needs to communicate with its parent process with synchronous IPC. This is very expensive for focus move.
Currently, IMEStateManager uses nsIWidget::GetInputContext() only for checking the IME enabled state. Therefore, it's enough to cache input context when nsIWidget::SetInputContext() is called. Then, we can avoid to communicate with synchronous IPC with PuppetWidget::GetInputContext() in most cases.
This patch makes IMEStateManager stores the last widget which sets input context. When PuppetWidget uses its input context cache, it should check if it is the last widget to set input context with IMEStateManager since an input context may be shared with other widgets and another one may have update the input context. I.e., PuppetWidget's input context cache may be already outdated after IMEStateManager sets input context with another widget.
This patch gives up to support retrieving IME open state from child process. However, perhaps, this is not necessary for everybody including add-on developers because the only user of IME open state in child process is nsIDOMWindowUtils. So, add-ons can send IME open state from chrome process instead. If this decision is wrong, unfortunately, we should support it again in another bug. It's easy to support with creating another nsIWidget::GetInputContext() or adding additional argument to it.
MozReview-Commit-ID: B2d2CCTsPKj
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extra : rebase_source : 4117330ba7871753176da960063b612e96f11752
