Add force save behavior to KEntryMap

Summary:
Fix the following bug, if an entry is set on HOME/.config/kdeglobals and on a specific config file like kcmfonts
When you hit restore defaults button and apply, value will be not wrote on the specific file, but then the value is the one from kdeglobals
This patch ensure we write the key to the specific configuration file on those case with an empty value. KConfig will take default value automatically

Test Plan:
Added a test to ensure flag is working
Tested using some KCM to ensure all is working fine

Reviewers: ervin, dfaure, meven, crossi, hchain

Reviewed By: ervin, dfaure, meven

Subscribers: kde-frameworks-devel

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D28128

autotests/kconfigtest.cpp

@@ -1949,3 +1949,30 @@ void KConfigTest::testNotify()
     QCOMPARE(otherWatcherSpy[0][0].value<KConfigGroup>().name(), QStringLiteral("TopLevelGroup"));
     QCOMPARE(otherWatcherSpy[0][1].value<QByteArrayList>(), QByteArrayList({"someGlobalEntry"}));
 }
+
+void KConfigTest::testKdeglobalsVsDefault()
+{
+    // Add testRestore key with global value in kdeglobals
+    KConfig glob(QStringLiteral("kdeglobals"));
+    KConfigGroup generalGlob(&glob, "General");
+    generalGlob.writeEntry("testRestore", "global");
+    QVERIFY(glob.sync());
+
+    KConfig local(QStringLiteral(TEST_SUBDIR "restorerc"));
+    KConfigGroup generalLocal(&local, "General");
+    // Check if we get global and not the default value from cpp (defaultcpp) when reading data from restorerc
+    QCOMPARE(generalLocal.readEntry("testRestore", "defaultcpp"), "global");
+
+    // Add test restore key with restore value in restorerc file
+    generalLocal.writeEntry("testRestore", "restore");
+    QVERIFY(local.sync());
+    local.reparseConfiguration();
+    // We expect to get the value from restorerc file
+    QCOMPARE(generalLocal.readEntry("testRestore", "defaultcpp"), "restore");
+
+    // Revert to default testRestore key and we expect to get default value and not the global one
+    generalLocal.revertToDefault("testRestore");
+    local.sync();
+    local.reparseConfiguration();
+    QCOMPARE(generalLocal.readEntry("testRestore", "defaultcpp"), "defaultcpp");
+}

autotests/kconfigtest.h

@@ -73,6 +73,8 @@ private Q_SLOTS:
 
     void testThreads();
 
+    void testKdeglobalsVsDefault();
+
     // should be last
     void testSyncOnExit();
 };

src/core/kconfigdata.cpp

@@ -100,6 +100,10 @@ bool KEntryMap::setEntry(const QByteArray &group, const QByteArray &key, const Q
         k = it.key();
         e = *it;
         //qDebug() << "found existing entry for key" << k;
+        // If overridden entry is global and not default. And it's overridden by a non global
+        if (e.bGlobal && !(options & EntryGlobal) && !k.bDefault) {
+            e.bOverridesGlobal = true;
+        }
     } else {
         // make sure the group marker is in the map
         KEntryMap const *that = this;

src/core/kconfigdata.h

@@ -24,7 +24,7 @@ struct KEntry {
     KEntry()
         : mValue(), bDirty(false),
           bGlobal(false), bImmutable(false), bDeleted(false), bExpand(false), bReverted(false),
-          bLocalizedCountry(false), bNotify(false) {}
+          bLocalizedCountry(false), bNotify(false), bOverridesGlobal(false) {}
     /** @internal */
     QByteArray mValue;
     /**
@@ -58,6 +58,11 @@ struct KEntry {
     bool    bLocalizedCountry: 1;
 
     bool     bNotify: 1;
+
+    /**
+     * Entry will need to be written on a non global file even if it matches default value
+     */
+    bool     bOverridesGlobal: 1;
 };
 
 // These operators are used to check whether an entry which is about

src/core/kconfigini.cpp

@@ -429,7 +429,10 @@ bool KConfigIniBackend::writeConfig(const QByteArray &locale, KEntryMap &entryMa
 
         // only write entries that have the same "globality" as the file
         if (it->bGlobal == bGlobal) {
-            if (it->bReverted) {
+            if (it->bReverted && it->bOverridesGlobal) {
+                it->bDeleted = true;
+                writeMap[key] = *it;
+            } else if (it->bReverted) {
                 writeMap.remove(key);
             } else if (!it->bDeleted) {
                 writeMap[key] = *it;