Only recreate GDF files if the mod selection requires to

[Alloc]

Instead of rebuilding all levels on installation only rebuild those that are affected by the mod selection.

Save what levels were affected by the old selection and compare to what is affected by the new one.

[Samer]

can you please clarify this Alloc a bit ?
if for example you have mods installed that affect level 0 and level 5 .. and install .. then you add a mod that affects level 6 with the previous 2 mods still selected and install .. will it rebuild level0 and level5 too or only level6 .. if only level6 this can lead to several issues : what if the content of the mods selected changed but not the selection .. in the previous example for modders if we are editing a package that affects level5 we only have to install again to test the changes .. if the next time we edit it and want to test, it sees that it's still same mod selection and doesn't rewrite level5 then the new content is not installed and everytime we have to test we will have to uninstall and then install, and i think modders are the ones who do the most installing \ uninstalling users select their favorite mods and usually stick with them ..
same for updates if a package is updated content is changed but not mod selection.

[Alloc]

Of course all affected levels (in your first example 0, 5, 6) are rebuild for the reasons you gave yourself ;)

[alloc]

In 809:

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