Fix total size

[ancorgs]

Problem

When the GuidedProposal uses the :bigger_resize strategy for making space, it receives a list of potential resize actions.

Combining LVM with a separate boot disk, it may happen that the list of resize actions include actions on partitions of the boot disks that are not needed, because there is already enough free space in the booting disk without resizing any partition.

Sometimes, that leaded to an exception in the algorithm of Proposal::PartitionsDistributionsCalculator.

Solution

Take the corner case into account and return a zero in the value for "missing size" (there is no need to resize).

Testing

• Added a new unit test
• Tested manually

[coveralls]

coverage: 97.815% (+0.005%) from 97.81%
when pulling 5deed73 on ancorgs:fix_total_size
into 123b26f on yast:master.

[joseivanlopez]

LGTM

[yast-bot]

✔️ Internal Jenkins job #1153 successfully finished
✔️ Created OBS submit request #1164333