cabana: make head section movable (#27971)

* set sections movable

* change setting key to v3

* add comment

* remove restorestate from MainWindow
old-commit-hash: f9568e9818

tools/cabana/mainwin.cc

@@ -39,7 +39,6 @@ MainWindow::MainWindow() : QMainWindow() {
     setGeometry(QApplication::desktop()->availableGeometry(this));
   }
   restoreState(settings.window_state);
-  messages_widget->restoreHeaderState(settings.message_header_state);
 
   qRegisterMetaType<uint64_t>("uint64_t");
   qRegisterMetaType<SourceSet>("SourceSet");

tools/cabana/messageswidget.cc

@@ -34,7 +34,11 @@ MessagesWidget::MessagesWidget(QWidget *parent) : QWidget(parent) {
   view->setItemsExpandable(false);
   view->setIndentation(0);
   view->setRootIsDecorated(false);
-  view->header()->setSectionsMovable(false);
+  // Must be called before setting any header parameters to avoid overriding
+  restoreHeaderState(settings.message_header_state);
+
+  view->header()->setSectionsMovable(true);
+
   main_layout->addWidget(view);
 
   // suppress
@@ -289,7 +293,7 @@ void MessageView::drawRow(QPainter *painter, const QStyleOptionViewItem &option,
   auto y = option.rect.y();
   painter->translate(visualRect(model()->index(0, 0)).x() - indentation() - .5, -.5);
   for (int i = 0; i < header()->count(); ++i) {
-    painter->translate(header()->sectionSize(i), 0);
+    painter->translate(header()->sectionSize(header()->logicalIndex(i)), 0);
     painter->drawLine(0, y, 0, y + option.rect.height());
   }
   painter->setPen(old_pen);

tools/cabana/settings.cc

@@ -30,7 +30,7 @@ void Settings::save() {
   s.setValue("geometry", geometry);
   s.setValue("video_splitter_state", video_splitter_state);
   s.setValue("recent_files", recent_files);
-  s.setValue("message_header_state_v2", message_header_state);
+  s.setValue("message_header_state_v3", message_header_state);
   s.setValue("chart_series_type", chart_series_type);
   s.setValue("theme", theme);
   s.setValue("sparkline_range", sparkline_range);
@@ -53,7 +53,7 @@ void Settings::load() {
   geometry = s.value("geometry").toByteArray();
   video_splitter_state = s.value("video_splitter_state").toByteArray();
   recent_files = s.value("recent_files").toStringList();
-  message_header_state = s.value("message_header_state_v2").toByteArray();
+  message_header_state = s.value("message_header_state_v3").toByteArray();
   chart_series_type = s.value("chart_series_type", 0).toInt();
   theme = s.value("theme", 0).toInt();
   sparkline_range = s.value("sparkline_range", 15).toInt();