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and User
The switch is necessary because MediaThumbnailJob is supposed to return something that can be worked on in non-GUI threads (as is the case of QML image providers), and QPixmap is not supposed for usage out of the main thread.
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The events are detected in /sync output, and avatars for rooms are loaded from respective URLs. Clients can use Room::avatar() method to request a pixmap of a certain size, and react to avatarChanged() in order to update the UI when new pixmaps/avatars arrive. avatarChanged() signal is overloaded with two tasks - the first firing merely indicates that a new avatar is available (without actual pixmap yet available) while the second firing means that an actual pixmap has arrived (all this is entirely transparent for clients, they just should update their pixmaps from Room::avatar() every time when Room::avatarChanged() is emitted).
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Avatars are also a property of rooms, and the supporting code is basically
the same. The only thing different will be emitted signals, and the cleanest
thing to support that (aside from making Avatar a QObject) seems to be to
parameterise the thumbnail-updating logic with a continuation invoked upon
completion of the thumbnail job.
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If all users suddenly don't have names, update to this commit, delete your cache and run again. Issue since 2bf912d6e6ddd9ff81a92ff28ac8c4c1d8f2d7e1.
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Note that although the mechanism is generic enough to change any user's
display name, The Spec states that power rules are very strict about it.
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avatarUrl() is not yet invokable from QML; I'm considering to make all the simple things in User Q_PROPERTies instead.
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Crop avatar to ensure it has exactly the wanted size; Fixes memory leak #45
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