1302295 - Cannot drag and drop file from file picker dialog

Status: RESOLVED WONTFIX

(Core :: Widget: Win32, defect, P3)

Description

[[ex-Mozilla] Agi Sferro | :agi]

Attachment: drop-from-picker.html

While testing we discovered that Firefox on Windows does not allow dragging and dropping files from the file picker dialog that opens when an <input type=file> is activated. It is not necessarily a bug, but it's definitely odd since it seems to work on Firefox on OSX and Chrome on Windows/OSX. I'm attaching a minimal repro case.

Comment 1

[Neil Deakin]

Since this is a modal dialog, this seems correct to me. Chrome on Windows actually hangs when the dialog is closed after dragging.

If anything, we should probably ignore drag events on Mac as well while a modal dialog is open.

Comment 2

[Firefox Bug Husbandry Bot]

https://wiki.mozilla.org/Bug_Triage/Projects/Bug_Handling/Bug_Husbandry#Move_fix-optionals

Comment 3

[Hsin-Yi Tsai (she/her)[:hsinyi]]

[domcore-bugbash-triaged] meeting : we think this is a widget problem.

Comment 4

[David Parks [:handyman]]

As noted in comment 1, Windows file pickers are modal by design -- we deliberately make them children of the browser. And I don't know of any expressed concerns about the DND behavior on Mac.