installer first says swap won't be formatted, then says it will

[gregrwm]

i already have the partitions i need, and the swap partition i already have is already known to other installs, so it'll be a bother to have to change the fstab and hibernate/restore information for them. my particular partition layout, in case it matters:

(parted) p all
Model: ATA WDC WD3200AAKS-0 (scsi)
Disk /dev/sda: 320GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
 1 1049kB 208GB 208GB primary ext4
 4 208GB 282GB 74.0GB primary btrfs boot
 3 282GB 284GB 2000MB primary linux-swap(v1)
 2 284GB 320GB 36.0GB extended
 5 284GB 293GB 9000MB logical ext3
 6 293GB 302GB 9000MB logical ext3
 7 302GB 311GB 9000MB logical ext3
 8 311GB 320GB 9000MB logical ext3

Model: Lexar USB Flash Drive (scsi)
Disk /dev/sdb: 16.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
 1 16.4kB 16.0GB 16.0GB primary fat32 lba

i selected partition 5, as ext4, for /. when i dismissed that dialog, i saw it had selected it for formatting, so i changed it to ext3, unchecked format, dismissed it again, saw it was still selected for format, unchecked it on the list this time rather than bringing up the dialog. a bit klunky there. reviewing the list, nothing is checked for format. good. clicked "install now". it warns me about / not being selected for format. fine by me. the next dialog informs me that partition 3 will be formatted as swap.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubiquity 2.21.5
ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2
Uname: Linux 3.18.0-9-generic i686
ApportVersion: 2.15.1-0ubuntu2
Architecture: i386
CasperVersion: 1.348
CurrentDesktop: GNOME
Date: Thu Mar 12 22:09:24 2015
InstallCmdLine: BOOT_IMAGE=(loop)/casper/vmlinuz iso-scan/filename=/home/greg/Downloads/ubuntu/vivid-desktop-i386.iso boot=casper panic=30 --
LiveMediaBuild: Ubuntu-GNOME 15.04 "Vivid Vervet" - Alpha i386 (20150120.1)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[gregrwm (gregrwm)]

the install complete and booted, i now see that swap was not formatted, consistent with as was presented in the partitioning summary. so the problem here is the misinforming dialog.

[Phillip Susi (psusi)]

IIRC, the debian-installer wants to always format swap, but when doing so, makes sure not to change the UUID if it already is formatted as swap.