391888 - Shift+click in a multiple select list only handles clicks on <option>s

Status: NEW

(Core :: Layout: Form Controls, defect)

Description

[Mats Palmgren (inactive)]

SHIFT+click in a multiple select list only handles clicks on <option>s.
For compatibility with other UAs[1] we should accept all clicks within
the padding area, eg. on <optgroup> labels.  Would should redirect such
clicks to the <option> closest to the event point, in the direction
of the selection start.

[1] IE7, Opera 9.20, Webkit/Safari

STEPS TO REPRODUCE
1. load the attached testcase
2. in the upper left list click "One"
3. Shift+click on "Group 2"

ACTUAL RESULT
nothing happens in 3

EXPECTED RESULT
selection is extended to be "One" .. "Three"


STEPS TO REPRODUCE #2
1. load the attached testcase
2. in the upper left list click "Six"
3. Shift+click on "Two"
4. Shift+click on "Group 2"

ACTUAL RESULT #2
nothing happens in 4

EXPECTED RESULT #2
selection becomes "Six" .. "Five", with focus ring around "Four"

Comment 1

[Mats Palmgren (inactive)]

Attachment: Testcase #1

Comment 2

[Mats Palmgren (inactive)]

Attachment: WIP

(This patch also includes the patch for bug 381982.)
This patch accepts clicks in the top/bottom padding area for Shift+click,
but not in the left/right padding for consistency with non-Shift click.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

The bug assignee is inactive on Bugzilla, so the assignee is being reset.