New shortcut for Copy with Headers and some self-documented shortcuts

Ctrl+H invokes the Copy with Headersers action in the Extended Table Widget
as suggested in #1058.

The following options in context menu display now their shortcuts:
Set to Null, Copy, Copy with Headers and Paste.

Some other shortcuts are now displayed in the corresponding tooltips.

src/EditDialog.ui

@@ -160,8 +160,8 @@
         <rect>
          <x>0</x>
          <y>0</y>
-         <width>83</width>
-         <height>40</height>
+         <width>98</width>
+         <height>35</height>
         </rect>
        </property>
        <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -212,6 +212,9 @@
      </item>
      <item>
       <widget class="QPushButton" name="buttonApply">
+       <property name="toolTip">
+        <string>Apply data to cell [Ctrl+Return]</string>
+       </property>
        <property name="text">
         <string>Apply</string>
        </property>

src/ExtendedTableWidget.cpp

@@ -95,6 +95,13 @@ ExtendedTableWidget::ExtendedTableWidget(QWidget* parent) :
     m_contextMenu->addAction(pasteAction);
     setContextMenuPolicy(Qt::CustomContextMenu);
 
+    // This is only for displaying the shortcut in the context menu.
+    // An entry in keyPressEvent is still needed.
+    nullAction->setShortcut(QKeySequence(tr("Alt+Del")));
+    copyAction->setShortcut(QKeySequence::Copy);
+    copyWithHeadersAction->setShortcut(QKeySequence(tr("Ctrl+H")));
+    pasteAction->setShortcut(QKeySequence::Paste);
+
     // Set up context menu actions
     connect(this, &QTableView::customContextMenuRequested,
             [=](const QPoint& pos)
@@ -389,11 +396,14 @@ void ExtendedTableWidget::keyPressEvent(QKeyEvent* event)
     // Call a custom copy method when Ctrl-C is pressed
     if(event->matches(QKeySequence::Copy))
     {
-        copy();
+        copy(false);
         return;
     } else if(event->matches(QKeySequence::Paste)) {
-        // Call a custom paste method when Ctrl-P is pressed
+        // Call a custom paste method when Ctrl-V is pressed
         paste();
+    } else if(event->modifiers().testFlag(Qt::ControlModifier) && (event->key() == Qt::Key_H)) {
+        // Call copy with headers when Ctrl-H is pressed
+        copy(true);
     } else if(event->key() == Qt::Key_Tab && hasFocus() &&
               selectedIndexes().count() == 1 &&
               selectedIndexes().at(0).row() == model()->rowCount()-1 && selectedIndexes().at(0).column() == model()->columnCount()-1) {

src/MainWindow.ui

@@ -22,7 +22,7 @@
     <item>
      <widget class="QTabWidget" name="mainTab">
       <property name="currentIndex">
-       <number>0</number>
+       <number>1</number>
       </property>
       <widget class="QWidget" name="structure">
        <attribute name="title">
@@ -130,7 +130,7 @@
           <item>
            <widget class="QToolButton" name="buttonRefresh">
             <property name="toolTip">
-             <string>Refresh the data in the selected table.</string>
+             <string>Refresh the data in the selected table [F5, Ctrl+R]</string>
             </property>
             <property name="whatsThis">
              <string>This button refreshes the data in the currently selected table.</string>