Enhancement: support priority for linemod

[Don-vip]

In stylesheets, it would be great to add "priority" as a known keywork for linemod, and implement the same behaviour as other tags (line, area, icon).

[stoecker]

Linemods are applied all together. What should priority do here?

[Don-vip]

I have created a stylesheet for power lines colouring, based on its voltage value, so I have many conditions like that:

<rule>

<condition k="voltage" v="63000"/>
<linemod mode="over" width="3" realwidth="3" colour="voltage-63#CE2C91"/>

</rule>

For underground cables, I'd like to render them as dashed lines, so I was thinking to this:

<rule>

<condition k="power" v="cable"/>
<condition k="voltage" v="63000"/>
<linemod mode="over" width="3" realwidth="3" colour="voltage-63#CE2C91" dashed="true" priority="10000"/>

</rule>

Indeed, it does not work today, so I had to create a rule for each item I want to be coloured (line, minor_line, station, sub_station, cable and so on). Priority would allow to define a default rule, and a special one for cables.

[bastiK]

You can achieve this in mapcss, by putting all voltage "linemods" on the voltage layer. Something like that:

way[voltage=63000]::voltage_layer {
 width: +3;
 color: #ce2c91;
 z-index: 10;
}

way[power=cable][voltage=63000]::voltage_layer {
 dashes: 4,6;
}