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Fix #9392: Return a valid value with GetBuildWithRefitCapacity when AIs are maxed out in vehicles #9393

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SamuXarick
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@SamuXarick SamuXarick commented Jun 21, 2021

Motivation / Problem

fixes #9392

Description

The problem is solved by allowing a unit number of 0 for temporary vehicles using DC_QUERY_COST flag which is passed by GetBuildWithRefitCapacity.

Limitations

I'm not really sure this will work in all cases. refitting and subflags and the temporary v that may and may not exist and then the DC_EXEC and non exec modes make it quite complex to test every scenario.

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

  • The bug fix is important enough to be backported? (label: 'backport requested')
  • This PR affects the save game format? (label 'savegame upgrade')
  • This PR affects the GS/AI API? (label 'needs review: Script API')
    • ai_changelog.hpp, gs_changelog.hpp need updating.
    • The compatibility wrappers (compat_*.nut) need updating.
  • This PR affects the NewGRF API? (label 'needs review: NewGRF')

@glx22 glx22 merged commit 76b8343 into OpenTTD:master Aug 11, 2021
@SamuXarick SamuXarick deleted the BuildWithRefitCapacity-max-vehicles-fix branch August 30, 2021 19:20
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AIVehicle.GetBuildWithRefitCapacity returns -1 when at the max num of vehicles
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