Update edit entry widget when backing entry changes

* Fixes #4060
* Also fix not emitting entryModified() when history is truncated. This possibly fixes other crashes with apply button when the history is truncated and then the history page is shown with a deleted entry.

src/core/Entry.cpp

@@ -663,6 +663,7 @@ void Entry::truncateHistory()
         return;
     }
 
+    bool changed = false;
     int histMaxItems = db->metadata()->historyMaxItems();
     if (histMaxItems > -1) {
         int historyCount = 0;
@@ -674,6 +675,7 @@ void Entry::truncateHistory()
             if (historyCount > histMaxItems) {
                 delete entry;
                 i.remove();
+                changed = true;
             }
         }
     }
@@ -697,9 +699,14 @@ void Entry::truncateHistory()
             if (size > histMaxSize) {
                 delete historyItem;
                 i.remove();
+                changed = true;
             }
         }
     }
+
+    if (changed) {
+        emit entryModified();
+    }
 }
 
 bool Entry::equals(const Entry* other, CompareItemOptions options) const

src/gui/entry/EditEntryWidget.cpp

@@ -118,6 +118,14 @@ EditEntryWidget::EditEntryWidget(QWidget* parent)
     setupHistory();
     setupEntryUpdate();
 
+    m_entryModifiedTimer.setSingleShot(true);
+    m_entryModifiedTimer.setInterval(0);
+    connect(&m_entryModifiedTimer, &QTimer::timeout, this, [this] {
+        if (isVisible() && m_entry) {
+            setForms(m_entry);
+        }
+    });
+
     connect(this, SIGNAL(accepted()), SLOT(acceptEntry()));
     connect(this, SIGNAL(rejected()), SLOT(cancel()));
     connect(this, SIGNAL(apply()), SLOT(commitEntry()));
@@ -785,6 +793,8 @@ void EditEntryWidget::loadEntry(Entry* entry,
     m_create = create;
     m_history = history;
 
+    connect(m_entry, &Entry::entryModified, this, [this] { m_entryModifiedTimer.start(); });
+
     if (history) {
         setHeadline(QString("%1 \u2B29 %2").arg(parentName, tr("Entry history")));
     } else {
@@ -1130,6 +1140,10 @@ void EditEntryWidget::cancel()
 
 void EditEntryWidget::clear()
 {
+    if (m_entry) {
+        m_entry->disconnect(this);
+    }
+
     m_entry = nullptr;
     m_db.reset();
 

src/gui/entry/EditEntryWidget.h

@@ -24,6 +24,7 @@
 #include <QModelIndex>
 #include <QPointer>
 #include <QScopedPointer>
+#include <QTimer>
 
 #include "config-keepassx.h"
 #include "gui/EditWidget.h"
@@ -198,6 +199,7 @@ private:
     QButtonGroup* const m_autoTypeWindowSequenceGroup;
     QCompleter* const m_usernameCompleter;
     QStringListModel* const m_usernameCompleterModel;
+    QTimer m_entryModifiedTimer;
 
     Q_DISABLE_COPY(EditEntryWidget)
 };

tests/gui/TestGui.cpp

@@ -499,9 +499,9 @@ void TestGui::testEditEntry()
     // Confirm edit was made
     QCOMPARE(m_dbWidget->currentMode(), DatabaseWidget::Mode::ViewMode);
     QCOMPARE(entry->title(), QString("Sample Entry_test"));
-    QCOMPARE(entry->foregroundColor(), fgColor);
+    QCOMPARE(entry->foregroundColor().toUpper(), fgColor.toUpper());
     QCOMPARE(entryItem.data(Qt::ForegroundRole), QVariant(fgColor));
-    QCOMPARE(entry->backgroundColor(), bgColor);
+    QCOMPARE(entry->backgroundColor().toUpper(), bgColor.toUpper());
     QCOMPARE(entryItem.data(Qt::BackgroundRole), QVariant(bgColor));
     QCOMPARE(entry->historyItems().size(), ++editCount);