"Install from URL" popup from Extension Manager won't accept keyboard input

[peterflynn]

1. Open Extension Manager
2. Click the "Install from URL..." button
3. Try to type in a URL

Result: can't type any text

Workaround: pasting (via keyboard or menu bar still works) -- though like all text fields, you can't right click > Paste, so this may go unnoticed by some users.

[peterflynn]

I think this is because both dialogs' Dialogs._handleKeyDown() listeners are active at once, and for any given key event one of those handlers is guaranteed to be unhappy with it and preventDefault().

Does Dialogs need an explicit knowledge of dialog nesting?

[njx]

To me for sprint 24, high priority.

[njx]

@peterflynn: yup, that's the approach I took in #3522. Want to review it?

[njx]

Reviewed.

[njx]

Moving out of this sprint since we're backing out the Extension Manager for now.

[njx]

Either this or @iwehrman's version needs to be in sprint 25 since we'll actually be turning on the extension manager dialog in this sprint.

[njx]

FBNC @peterflynn (this should be testable in the current Extension Manager in master even though it's not final)

[njx]

oops, forgot to reassign to @peterflynn

[peterflynn]

Oops, forgot to close this a while ago -- is definitely fixed