Refactor Database and Database widgets (#2491)

The Database, DatabaseWidget, and DatabaseTabWidget classes share many responsibilities in inconsistent ways resulting in impenetrable and unmaintainable code and a diverse set of bugs and architecture restrictions. This patch reworks the architecture, responsibilities of, and dependencies between these classes.

The core changes are:

* Move loading and saving logic from widgets into the Database class
* Get rid of the DatabaseManagerStruct and move all the information contained in it into the Database
* Let database objects keep track of modifications and dirty/clean state instead of handing this to external widgets
* Move GUI interactions for loading and saving from the DatabaseTabWidget into the DatabaseWidget (resolves #2494 as a side-effect)
* Heavily clean up DatabaseTabWidget and degrade it to a slightly glorified QTabWidget
* Use QSharedPointers for all Database objects
* Remove the modifiedImmediate signal and replace it with a markAsModified() method
* Implement proper tabName() method instead of reading back titles from GUI widgets (resolves #1389 and its duplicates #2146 #855)
* Fix unwanted AES-KDF downgrade if database uses Argon2 and has CustomData
* Improve code

This patch is also the first major step towards solving issues #476 and #2322.

1 files changed, 4 insertions, 4 deletions

diff --git a/tests/TestKdbx4.h b/tests/TestKdbx4.h
index edf319a96..e5fd85ae3 100644
--- a/tests/TestKdbx4.h
+++ b/tests/TestKdbx4.h
@@ -35,18 +35,18 @@ private slots:
 protected:
     void initTestCaseImpl() override;
 
-    Database* readXml(QBuffer* buf, bool strictMode, bool& hasError, QString& errorString) override;
-    Database* readXml(const QString& path, bool strictMode, bool& hasError, QString& errorString) override;
+    QSharedPointer<Database> readXml(QBuffer* buf, bool strictMode, bool& hasError, QString& errorString) override;
+    QSharedPointer<Database> readXml(const QString& path, bool strictMode, bool& hasError, QString& errorString) override;
     void writeXml(QBuffer* buf, Database* db, bool& hasError, QString& errorString) override;
 
     void readKdbx(const QString& path,
                   QSharedPointer<const CompositeKey> key,
-                  QScopedPointer<Database>& db,
+                  QSharedPointer<Database> db,
                   bool& hasError,
                   QString& errorString) override;
     void readKdbx(QIODevice* device,
                   QSharedPointer<const CompositeKey> key,
-                  QScopedPointer<Database>& db,
+                  QSharedPointer<Database> db,
                   bool& hasError,
                   QString& errorString) override;
     void writeKdbx(QIODevice* device, Database* db, bool& hasError, QString& errorString) override;