Add search help pop-up

* Support ! modifier (same as '-')

src/core/EntrySearcher.cpp

@@ -96,6 +96,7 @@ bool EntrySearcher::searchEntryImpl(const QString& searchString, Entry* entry)
             found = !attachments.filter(term->regex).empty();
             break;
         default:
+            // Terms without a specific field try to match title, username, url, and notes
             found = term->regex.match(entry->resolvePlaceholder(entry->title())).hasMatch() ||
                     term->regex.match(entry->resolvePlaceholder(entry->username())).hasMatch() ||
                     term->regex.match(entry->resolvePlaceholder(entry->url())).hasMatch() ||
@@ -139,7 +140,7 @@ QList<QSharedPointer<EntrySearcher::SearchTerm> > EntrySearcher::parseSearchTerm
         term->regex = Tools::convertToRegex(term->word, !mods.contains("*"), mods.contains("+"), m_caseSensitive);
 
         // Exclude modifier
-        term->exclude = mods.contains("-");
+        term->exclude = mods.contains("-") || mods.contains("!");
 
         // Determine the field to search
         QString field = result.captured(2);

src/gui/MainWindow.cpp

@@ -129,6 +129,7 @@ MainWindow::MainWindow()
     // Setup the search widget in the toolbar
     SearchWidget* search = new SearchWidget();
     search->connectSignals(m_actionMultiplexer);
+    connect(this, SIGNAL(windowMoved()), search, SLOT(windowMoved()));
     m_searchWidgetAction = m_ui->toolBar->addWidget(search);
     m_searchWidgetAction->setEnabled(false);
 
@@ -775,6 +776,12 @@ void MainWindow::changeEvent(QEvent* event)
     }
 }
 
+void MainWindow::moveEvent(QMoveEvent* event)
+{
+    emit windowMoved();
+    QMainWindow::moveEvent(event);
+}
+
 void MainWindow::saveWindowInformation()
 {
     if (isVisible()) {

src/gui/MainWindow.h

@@ -55,6 +55,9 @@ class MainWindow : public QMainWindow
         PasswordGeneratorScreen = 3
     };
 
+signals:
+    void windowMoved();
+
 public slots:
     void openDatabase(const QString& fileName, const QString& pw = QString(), const QString& keyFile = QString());
     void appExit();
@@ -78,6 +81,7 @@ public slots:
 protected:
     void closeEvent(QCloseEvent* event) override;
     void changeEvent(QEvent* event) override;
+    void moveEvent(QMoveEvent* event) override;
 
 private slots:
     void setMenuActionState(DatabaseWidget::Mode mode = DatabaseWidget::None);