mergeQueries() could merge more

[kukeiko]

given 3 queries A, B & C:

• A can not be merged with B
• A can be merged with C
• B can be merged with C

merge(A, C) might now be mergeable with merge(A, B) - which is something that is not currently detected and done. as a workaround, to have the products example working, the workspace merges queries twice after adding a newly executed query into the cache.

example:

• A = [1, 7]
• B = [13, 20]
• C = [7, 13]

after first run, we currently get:

• merge(A, C) = [1, 13]
• merge(B, C) = [13, 20]

but should instead get:

• merge(A, B, C) = [1, 20]

[kukeiko]

I think the same issue can happen when merging two or-criteria

[kukeiko]

Pretty sure this got closed by accident, reopening