[regression] Button_a11y: Enter key stops working in IE9

[haysmark]

If you run the dijit form tests in IE9 in the DOH runner, you will notice "dijit.form.DropDownButton::enter opens menu" fails.

To manually reproduce this failure:

1. Open ​http://archive.dojotoolkit.org/nightly/checkout/dijit/tests/form/test_Button.html in IE9
2. Tab to Edit
3. Press Enter. The popup will open as expected.
4. Click once on the text, "Buttons can do an action, display a menu, or both:".
5. Tab to the Edit button again.
6. Press Enter. The popup will not open this time.

If you subsequently refresh the page, the Enter button will still be broken. You will have to close the tab and reopen it to fix it.

[Douglas Hays]

Refs #14954. ENTER is no longer triggering Button clicks on IE9 starting with [29144].

[bill]

I don't know why it's failing but might as well switch _HasDropDown to use dojo/on and avoid the issue, since we will need to do that for 2.0 anyway.

[bill]

In [29331]:

Fix ENTER key click on IE9 (for _HasDropDown) as well as SPACE key click on FF (for a11yclick).

Switched from synthetic dojo/_base/connect keypress event to native keydown event. In practical terms, that means that the dropDownWidget.handleKey() callback from _HasDropDown now gets passed an event where keyCode is set rather than charOrCode, and you check for a space character as evt.keyCode == keys.SPACE rather than evt.charOrCode == " ".

Fixes #15709 !strict.

[haysmark]

This was working in 1.6 and 1.7 branches so doesn't need to be backported.

[bill]

OK, good. See also #14954 and #16570 though.

[Bill Keese <bill@…>]

In c8f651b2100df8d0b433174a5f31b5b86b0f7774/dijit:

Error: Processor CommitTicketReference failed

Unsupported version control system "git": Can't find an appropriate component, maybe the corresponding plugin was not enabled?