[tbb-bugs] #22618 [Applications/Tor Browser]: Downloading pdf file via file:/// is stalling if the external helper dialog is enabled

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#22618: Downloading pdf file via file:/// is stalling if the external helper dialog
is enabled
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-7.0-issues, tbb-regression,      |  Actual Points:
  tbb-e10s                                       |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by mcs):

 I missed the fact that it had to be a local file (sorry!)
 The cause is likely similar to that of #22471; my guess without looking at
 the code or debugging this problem is that the file: URL handler does not
 support the Suspend() / Resume() mechanism we added to work around #21766
 and related problems. It seems like we will need to use a different
 technique to solve all of the problems, e.g., we could implement our
 download warning dialog the same way Mozilla implements their download-
 related prompts. Their prompts are asynchronous (which means the download
 proceeds while the user thinks about how to respond) but somehow the final
 download is blocked until the user finishes interacting with the dialog
 window. Maybe we can use Suspend() when it will work (i.e. for HTTP-based
 downloads) and skip the Suspend() in other cases.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22618#comment:5>
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