[tbb-bugs] #32308 [Applications/Tor Browser]: Stop inner letterbox jiggling as border is dragged

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#32308: Stop inner letterbox jiggling as border is dragged
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 Reporter:  cypherpunks                          |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-9.0-issues, tbb-fingerprinting-  |  Actual Points:
  resolution                                     |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by pospeselr):

 So I looked into this since I'm currently working on #32220.

 Adding an onresize event to the window object seems to indicate that
 intermediate rescaling (and therefore jiggle) does occur. IE stretching a
 window whos browser element is set to width 1000, will see something like
 width 1013 after stretch before the letterboxing logic kicks in resets it
 back to 1000 (or 1100 if the stretch is large enough).

 So there is some aspect of jiggle there in terms of the browse element
 growing and shrinking (or vice versa) due to users rescaling. Of course
 there will be the appearance of movement since rescaling implies
 recentering, but in that case it should be movement in one direction, not
 jiggle/jitter. It seems to me that whatever CSS rule is applied to the
 browser element is not setting it to a fixed size, but some sort of
 scaling that the letterboxing code then snaps back, but I would need to
 investigate further to be sure on how the implementation actually works.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32308#comment:5>
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