full-upgrade: Mark phased upgrades for keep before anything else

By marking them at the end, we might make other decisions that
depend on the new phased updates, confusing the solver. Run the
marking at the start too.

The EDSP test file from Jeremy was modified to include Machine-ID
and Phased-Update-Percentage fields and then filtered to mostly
exclude packages irrelevant to the test case by running

    grep-dctrl   \( -FRequest "EDSP 0.5" -o -FInstalled yes \
                    -oFPhased-Update-Percentage 10  \)  \
                -a --not -FArchitecture i386

LP: #1990586

1 files changed, 42 insertions, 0 deletions

diff --git a/test/integration/test-ubuntu-bug-1990586 b/test/integration/test-ubuntu-bug-1990586
new file mode 100755
index 000000000..415c5027e
--- /dev/null
+++ b/test/integration/test-ubuntu-bug-1990586
@@ -0,0 +1,42 @@
+#!/bin/sh
+set -e
+
+TESTDIR="$(readlink -f "$(dirname "$0")")"
+. "$TESTDIR/framework"
+
+setupenvironment
+
+configarchitecture 'amd64'
+
+noprogress() {
+    "$@" | sed /^Progress/d
+}
+
+# The important thing in this bug is that python3.10 and python3.10-defaults are phasing differently,
+# so both should be kept back rather than one causing tons of removals.
+# This should effectively be a no-op
+testsuccessequal "Percentage: 0
+Message: Start up solver…
+
+Percentage: 1
+Message: Read request…
+
+Percentage: 5
+Message: Read scenario…
+
+Percentage: 50
+Message: Apply request on scenario…
+
+Percentage: 60
+Message: Call problemresolver on current scenario…
+
+Percentage: 95
+Message: Write solution…
+
+Autoremove: 74428
+Package: systemd-hwe-hwdb:amd64
+Version: 249.11.1
+
+Percentage: 100
+Message: Done
+" noprogress runapt "${APTHELPERBINDIR}/solvers/apt" < $TESTDIR/edsp-ubuntu-bug-1990586