Add 'copy-on-doubleclick' feature to entry view table

Add 'copy-on-doubleclick' feature to entry view table by extending
already existing DatabaseWidget::entryActivationSignalReceived().

Currently, username, password and notes are copyied on doubleclick,
while doubleclicking URL still opens browser as before.

Can easily be extended to account for other/additional columns
(switch-case).

src/gui/DatabaseWidget.cpp

@@ -908,12 +908,39 @@ void DatabaseWidget::unlockDatabase(bool accepted)
     }
 }
 
+/**
+ * @author Fonic <https://github.com/fonic>
+ * Add 'copy-on-doubleclick' functionality for certain columns
+ *
+ * TODO:
+ * If pull request #1298 gets merged, double-clicking column 'Attachments'
+ * could open the new details view (see second screenshot)
+ */
 void DatabaseWidget::entryActivationSignalReceived(Entry* entry, EntryModel::ModelColumn column)
 {
-    if (column == EntryModel::Url && !entry->url().isEmpty()) {
+    /* Should never happen */
+    if (!entry) {
+        Q_ASSERT(false);
+        return;
+    }
+
+    /* Decide what to do based on specified column */
+    switch (column) {
+    case EntryModel::Username:
+        setClipboardTextAndMinimize(entry->resolveMultiplePlaceholders(entry->username()));
+        break;
+    case EntryModel::Password:
+        setClipboardTextAndMinimize(entry->resolveMultiplePlaceholders(entry->password()));
+        break;
+    case EntryModel::Url:
+        if (!entry->url().isEmpty()) {
             openUrlForEntry(entry);
         }
-    else {
+        break;
+    case EntryModel::Notes:
+        setClipboardTextAndMinimize(entry->resolveMultiplePlaceholders(entry->notes()));
+        break;
+    default:
         switchToEntryEdit(entry);
     }
 }