When we tap in a photo, we are in fact opening a list of media that user
can navigate when swiping right and left. The fact that we are seeing
requests for videos when opening a photo is related with the way this
list cache is implemented in gallery. With the new MR linked here,
gallery should not request any thumbnail with (0, 0) but we still could
request two videos thumbnails for each video. One for fullscreen and one
for not fullscreen mode when in device (on desktop, we should request
more sizes), since the sourceSize is linked with window height/width.
Let me know if that is good enough or if we should go for a one size
fits all approach, requesting a thumbnail big enough (maybe a single
(0,0)) and using it as our thumbnail for all the window sizes.

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https://bugs.launchpad.net/bugs/1467743

Title:
  Lots of thumbnail requests with invalid size

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