AIs test station catchment in reverse to how players see station catchment.
This did not take account of non-rectangular station catchment areas, so AIs
could end up placing stations in locations that did not accept/deliver cargo.
In the autoreplace window, the rail type drop down is for choosing engines
of the given time. Many rail types do not have engines specifically designed for them,
and are merely compatible with other rail types. This list is thus unwieldy and many
options have no engines available.
As this drop down is for choosing _engine_ rail type rather than compatible rail types,
we can list just the rail types explicitly listed by engines.
Linkgraph nodes require a specific order that was maintained by swapping just the last
element for the node to be removed. std::vector::erase() changed this to removing the
node is then shuffling the remain items down, which upsets other references to this
indices.
This is fixed by switching back to the original swap & pop method.
Display of industry production around tiles (as shown when placing a station)
did not take account of the station catchment changes, so still showed production
from an industry even if it was not covered by a tile.
This is fixed by making a set of nearby industries that are covered, instead of
looping over all possible industries.
Sign width was only updated when the text was changed. This seems to work for player-placed
signs as there is always a rename operation, however AIs can create a sign with text in one
go, in which case the width was never set.
This change is a controlled by a game setting, located under Environment ->
Industries which allows toggling the behaviour. It defaults to enabled.
"Company stations can serve industries with attached neutral stations"
When enabled, industries with attached neutral station (such as Oil Rigs) may
also be served by company-owned stations built nearby. This is the traditional
behaviour.
When disabled, these industries may only be served by their neutral station.
Any nearby company-owned stations won't be able to serve them, nor will the
neutral station serve anything else other than the industry.
This only affects failed town generation, as towns do not delete bridges under any other circumstances.
The existing test performed badly with a large number of towns due to having to calculate the
nearest town, and also by its nature assumed a bridge was built by the nearest town, leading
to bridges of nearby large towns be removed incorrectly.
If we gain the ability to quickly retrieve the correct town (which is _not_ the nearest town) from the bridge, this change should be reviewed.
* Change: Replace checkbox in livery selection window with Default option in drop down selection.
This reduces clutter in the UI and allows for primary/secondary colours to independently follow the default scheme if desired.
* Feature: Add vehicle group liveries.
