feat: count a card's messages, not its repliesthread-row-identity

The expander pill read "N replies" while the row stood for the
conversation: a thread of one message and four replies said "4 replies"
over rows that listed all five messages. The user's model is messages, so
it now reads "5 messages". A thread of one still shows nothing: its row is
the message, the pill is the expander, and there is nothing to open.

ReplyCountRole becomes MessageCountRole and CardLayout::Input::replyCount
becomes messageCount, so the names stop lying about what they carry. The
label is now translated under a CardLayout context, with Italian
"messaggio"/"messaggi" shipped; %n's untranslated fallback on this Qt does
not pluralise, so the two forms are separate entries. The card's densest
geometry test needs 460px rather than 400 now that the pill is one
character wider.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/threadlistview.cpp b/src/threadlistview.cpp
index 5a3ce77..019d7c9 100644
--- a/src/threadlistview.cpp
+++ b/src/threadlistview.cpp
@@ -27,10 +27,10 @@ void ThreadListView::mousePressEvent(QMouseEvent *event)
 {
     const QModelIndex index = indexAt(event->pos());
 
-    // The reply count IS the expander. Anything outside its rect selects the
+    // The message count IS the expander. Anything outside its rect selects the
     // card and opens it, which is what the rest of the card is for.
     if (event->button() == Qt::LeftButton && index.isValid()
-        && index.data(ThreadListModel::ReplyCountRole).toInt() > 0) {
+        && index.data(ThreadListModel::MessageCountRole).toInt() > 0) {
 
         QStyleOptionViewItem option;
         initViewItemOption(&option);