Sidebar: add shortcut for description box

Sidebar.qml

@@ -123,10 +123,24 @@ Page {
                     onTextChanged: modified = true
                     KeyNavigation.priority: KeyNavigation.BeforeItem
                     KeyNavigation.tab: events
+
+                    Shortcut {
+                        id: shortcutDescription
+                        sequence: 'Ctrl+D'
+                        onActivated: description.forceActiveFocus()
+                    }
+                    Label {
+                        anchors { right: parent.right; bottom: parent.bottom; margins: 4 }
+                        visible: !parent.activeFocus
+                        text: shortcutDescription.nativeText
+                        font.pixelSize: parent.font.pixelSize * 0.75
+                        color: 'gray'
+                    }
                 }
             }
         }
 
+        // Filter box.
         TextField {
             id: filter
             Layout.fillWidth: true
@@ -148,6 +162,7 @@ Page {
             }
         }
 
+        // Event list.
         Frame {
             Layout.fillWidth: true
             Layout.fillHeight: true
@@ -192,6 +207,7 @@ Page {
             }
         }
 
+        // Tags box.
         Flow {
             id: tags