Revert the SIC in commit 915976c123.

On further reflection, introducing a SIC to fix the bug is not ideal.  I'm
working on something that will address the underlying bug, but I didn't have
it in time for 5.7.

The versioning behaviour is left, as I do want it to exist for the future.
This only reverts the mandatory versioning of files to avoid the compatibility
break.

CHANGELOG: Undo 915976c123, which never saw a release, enough to avoid the SIC.

autotests/test_kconf_update.cpp

@@ -262,7 +262,7 @@ void TestKConfUpdate::test_data()
             << true
             << true
             ;
-    QTest::newRow("DontMigrateWhenFileDoesntHaveVersion")
+    QTest::newRow("MigrateWhenFileDoesntHaveVersion")
             <<
             "File=testrc\n"
             "Group=group\n"
@@ -276,12 +276,15 @@ void TestKConfUpdate::test_data()
             <<
             "testrc"
             <<
+            "[$Version]\n"
+            "update_info=%1\n"
+            "\n"
             "[group]\n"
-            "old=value\n"
+            "new=value\n"
             <<
             ""
             << false
-            << false
+            << true
             ;
 
     QTest::newRow("DontMigrateWhenUpdateCantDoItMissingFilename")

src/kconf_update/README.kconf_update

@@ -51,8 +51,9 @@ Commas (,) are used to seperate fields and may not occur as part
 of any field and all of the keywords are case-sensitive, i.e. you
 cannot say "key" instead of "Key" for example.
 
-Starting from KDE Frameworks 5 make sure to put Version=5 before the first "Id=" otherwise the upd file
-will be skipped and the config file will not be updated.
+Starting in KDE Frameworks 5, all update files should have a version field
+at the top of the file.  Thus all files should start with the line Version=5.
+Files without a version are currently treated as version 5 but are deprecated.
 
 For the rest the file is parsed and executed sequentially from top to bottom.
 Each line can contain one entry. The following entries are recognized:

src/kconf_update/kconf_update.cpp

@@ -252,8 +252,7 @@ bool KonfUpdate::checkFile(const QString &filename)
         }
         if (line.startsWith("Id=")) {
             if (!foundVersion) {
-                qDebug() << QStringLiteral("Missing \"Version=5\", file \'%1\' will be skipped.").arg(filename);
-                return true;
+                qDebug() << QStringLiteral("Missing \"Version=5\", file \'%1\' will be skipped in the future.").arg(filename);
             }
             id = m_currentFilename + ':' + line.mid(3);
         } else if (line.startsWith("File=")) {
@@ -336,8 +335,7 @@ bool KonfUpdate::updateFile(const QString &filename)
         }
         if (m_line.startsWith(QLatin1String("Id="))) {
             if (!foundVersion) {
-                qDebug() << QStringLiteral("Missing \"Version=5\", file \'%1\' will be skipped.").arg(filename);
-                break;
+                qDebug() << QStringLiteral("Missing \"Version=5\", file \'%1\' will be skipped in the future.").arg(filename);
             }
             gotId(m_line.mid(3));
         } else if (m_skip) {