1458893 - Include grid area names in auto-completion of grid item placement values

Status: NEW

(DevTools :: Inspector: Rules, defect, P3)

Description

[Mats Palmgren (inactive)]

Attachment: Testcase

STEPS TO REPRODUCE
1. open the attached testcase in Nightly
2. open devtools and select one of the <x> grid items
3. in the Rules panel, add a new placement property [1] for the element
   and look at the auto-completion menu for its value
4. type "a"

ACTUAL RESULTS
"a-start" and "a-end" is included, but not "a".
Entering the value "a" is actually somewhat difficult now
since once you type the "a" the value "a-end" is automatically
filled in so you have manually delete the "-end" part to enter
"a" as a value.

EXPECTED RESULTS
In the second grid, I tend to think "a" should definitely
be included in the menu since it's an explicit area name.

In the first grid, "a" *may* be included since it's an
implicit area name.  I'm not sure if authors would be
confused about it though (compare bug 1456590).
(It's definitely a valid value on all of the item placement
properties though.)

Fwiw, in the second grid, I think using the area name instead
of line names is probably the more natural choice, and it's
shorter too.

[1]
grid-area
grid-column
grid-column-start
grid-column-end
grid-row
grid-row-start
grid-row-end