911918 - [OS X] Modifier flags aren't set in dragover event when dragging in external file

Status: NEW

(Core :: DOM: Copy & Paste and Drag & Drop, defect, P5)

Description

[Dan Stillman]

Attachment: testcase

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:23.0) Gecko/20100101 Firefox/23.0 (Beta/Release)
Build ID: 20130814063812

Steps to reproduce:

On OS X, event.metaKey and others aren't set properly within the 'dragover' event when dragging a file into Firefox from the OS. If a modifier key is pressed while over an element, the flags are set correctly for a few calls of the event and then revert to false. The flags are correct in the 'drop' event and in the few 'dragover' events preceding it. They're also correct on Windows and when dragging elements from within Firefox.

To reproduce, enable browser.dom.window.dump.enabled, load dragtest.xul, drag a file over the orange area, and press modifier keys while viewing the console output.

Comment 1

[Paul Silaghi, QA [:pauly]]

(In reply to Dan Stillman from comment #0)
> To reproduce, enable browser.dom.window.dump.enabled, load dragtest.xul,
> drag a file over the orange area, and press modifier keys while viewing the
> console output.
"This page uses an unsupported technology that is no longer available by default in Firefox." after loading the testcase with browser.dom.window.dump.enabled = TRUE

Comment 2

[Dan Stillman]

(In reply to Paul Silaghi [QA] from comment #1)
> "This page uses an unsupported technology that is no longer available by
> default in Firefox."

That's just referring to Remote XUL. It'd be the same with any example XUL file. If you want to test a XUL file from here, you have to either copy it somewhere and load it via a chrome:// URL or, easier, whitelist Remote XUL for bugzilla.mozilla.org using the Remote XUL Manager extension.[1]

(An HTML example might exhibit this behavior too, but I've only tested XUL.)


[1] https://addons.mozilla.org/en-us/firefox/addon/remote-xul-manager/

Comment 3

[Paul Silaghi, QA [:pauly]]

Ok, so far so good.

(In reply to Dan Stillman from comment #0)
> the flags are set correctly for a few calls
What flags?

> To reproduce, enable browser.dom.window.dump.enabled, load dragtest.xul,
> drag a file over the orange area, and press modifier keys while viewing the
> console output.
How do you see the drag/drop events? Web Console shows nothing by default.

Comment 4

[Dan Stillman]

(In reply to Paul Silaghi [QA] from comment #3)
> > the flags are set correctly for a few calls
> What flags?

The flags this bug report is about: event.metaKey, etc. They're listed in the console output from my testcase.
 
> > To reproduce, enable browser.dom.window.dump.enabled, load dragtest.xul,
> > drag a file over the orange area, and press modifier keys while viewing the
> > console output.
> How do you see the drag/drop events? Web Console shows nothing by default.

browser.dom.window.dump.enabled enables logging to the system console. You need to start Firefox from the command line to see the output. On Windows you also have to pass the -console flag.

https://developer.mozilla.org/en-US/docs/Web/API/Window.dump

Comment 5

[Paul Silaghi, QA [:pauly]]

Thanks for clearing things up!
(In reply to Dan Stillman from comment #0)
> If a modifier key is
> pressed while over an element, the flags are set correctly for a few calls
> of the event and then revert to false. 
Confirmed in nightly 27.0a1 2013-10-16, Mac OS X 10.8.4. Works fine on Win.

Comment 6

[Jens Stutte [:jstutte]]

Bulk-downgrade of unassigned, >=5 years untouched DOM/Storage bugs' priority and severity.

If you have reason to believe this is wrong, please write a comment and ni :jstutte.