Load the index when dependencies are needed

src/alr/alr-commands-show.adb

@@ -70,6 +70,8 @@ package body Alr.Commands.Show is
          end if;
 
          if Cmd.Graph or else Cmd.Solve or else Cmd.Tree then
+            Cmd.Requires_Full_Index (Force_Reload => True);
+
             declare
                Needed : constant Query.Solution :=
                           (if Current

testsuite/tests/show/solve-remote/test.py

@@ -0,0 +1,23 @@
+"""
+Verify the proper solving of dependencies with `alr show --solve <crate>`
+"""
+
+import re
+
+from drivers.alr import run_alr
+from drivers.asserts import assert_eq, assert_match
+
+p = run_alr("show", "hello", "--solve")
+
+# Should not be missing dependencies
+assert_match(".*" +
+             re.escape("""
+Dependencies (solution):
+   libhello=1.0.0
+Dependencies (graph):
+   hello=1.0.1 --> libhello=1.0.0 (^1.0)
+""") +
+             ".*",
+             p.out)
+
+print('SUCCESS')

testsuite/tests/show/solve-remote/test.yaml

@@ -0,0 +1,3 @@
+driver: python-script
+indexes:
+    basic_index: {}