MediaLibrary: Bump model to version 9

This is only a rescan, due to changes in album detection and MRL
encoding

src/MediaLibrary.cpp

@@ -799,6 +799,18 @@ InitializeResult MediaLibrary::updateDatabaseModel( unsigned int previousVersion
                 migrateModel7to8();
                 previousVersion = 8;
             }
+            if ( previousVersion == 8 )
+            {
+                // Multiple changes justify the rescan:
+                // - Changes in the way we chose to encode or not MRL, meaning
+                //   potentially all MRL are wrong (more precisely, will
+                //   mismatch what VLC expects, which makes playlist analysis
+                //   break.
+                // - Fix in the way we chose album candidates, meaning some
+                //   albums were likely to be wrongfully created.
+                forceRescan();
+                previousVersion = 9;
+            }
             // To be continued in the future!
 
             // Safety check: ensure we didn't forget a migration along the way

src/Settings.cpp

@@ -32,7 +32,7 @@
 namespace medialibrary
 {
 
-const uint32_t Settings::DbModelVersion = 8u;
+const uint32_t Settings::DbModelVersion = 9u;
 
 Settings::Settings( MediaLibrary* ml )
     : m_ml( ml )

test/unittest/MiscTests.cpp

@@ -138,8 +138,6 @@ TEST_F( DbModel, Upgrade7to8 )
     LoadFakeDB( SRC_DIR "/test/unittest/db_v7.sql" );
     auto res = ml->initialize( "test.db", "/tmp", cbMock.get() );
     ASSERT_EQ( InitializeResult::Success, res );
-    // V8 adds Artist::nb_tracks and should compute the values automatically
-    auto a = std::static_pointer_cast<Artist>( ml->artist( 3 ) );
-    ASSERT_NE( nullptr, a );
-    ASSERT_EQ( 5u, a->nbTracks() );
+    // Removed post migration tests starting with V9, since we force a re-scan,
+    // there is no content left to test
 }