orderone doesn't work when placing building foundations

[serveurix]

When placing several buildings in a row (farms, panic houses), one might want all the group of builders to build the first one, and only one builder to build the next ones.

The "orderone" modifier key allows to send only one unit of the group to a task : it works for move, resource collection, garrison, but apparently not for building placement (note that my "orderone" key is Alt)

Please allow it.

[Freagarach]

This is because preselected actions do not support the "orderone"-key currently, see Input.js. Wrong actually it should work for preselected actions. Although constructing buildings is not supported yet.

[Freagarach]

Easy fix: duplicate or make a function of some logic in handleUnitAction and use in tryPlaceBuilding. Perhaps some more involved fix would be better. Both in input.js.

(For the preselected actions see ​Phab:D2729.)

[Imarok]

In 23651:

Allow "orderone"-hotkey for preselected actions.

Patch By: Freagarach
Refs #5750
Differential Revision: ​https://code.wildfiregames.com/D2729

[wraitii]

In 23830:

Handle 'orderone' hotkey for constructing buildings and walls

This was missing in rP20441.

Based on a patch by: luiko

Also reported by: serveurix

Tested by: Freagarach

Fixes #5750

Differential Revision: ​https://code.wildfiregames.com/D2172