refactor: fix sonarcloud warnings (#3649)

* refactor: help sonarcloud to see that tr_bandwidth dtor does not throw

* refactor: use std::map instead of QMap in qt FileTreeModel

libtransmission/bandwidth.cc

@@ -101,15 +101,22 @@ static void remove_child(std::vector<tr_bandwidth*>& v, tr_bandwidth* remove_me)
     }
 }
 
+void tr_bandwidth::deparent() noexcept
+{
+    if (parent_ == nullptr)
+    {
+        return;
+    }
+
+    remove_child(parent_->children_, this);
+    parent_ = nullptr;
+}
+
 void tr_bandwidth::setParent(tr_bandwidth* new_parent)
 {
     TR_ASSERT(this != new_parent);
 
-    if (this->parent_ != nullptr)
-    {
-        remove_child(this->parent_->children_, this);
-        this->parent_ = nullptr;
-    }
+    deparent();
 
     if (new_parent != nullptr)
     {

libtransmission/bandwidth.h

@@ -88,9 +88,9 @@ public:
     {
     }
 
-    ~tr_bandwidth()
+    ~tr_bandwidth() noexcept
     {
-        this->setParent(nullptr);
+        deparent();
     }
 
     tr_bandwidth& operator=(tr_bandwidth&&) = delete;
@@ -119,6 +119,8 @@ public:
 
     void setParent(tr_bandwidth* new_parent);
 
+    void deparent() noexcept;
+
     [[nodiscard]] constexpr tr_priority_t getPriority() const noexcept
     {
         return this->priority_;

qt/FileTreeModel.cc

@@ -286,9 +286,12 @@ void FileTreeModel::clearSubtree(QModelIndex const& top)
         return;
     }
 
-    if (item->fileIndex() != -1)
+    if (auto const idx = item->fileIndex(); idx != -1)
     {
-        index_cache_.remove(item->fileIndex());
+        if (auto const iter = index_cache_.find(idx); iter != std::end(index_cache_))
+        {
+            index_cache_.erase(iter);
+        }
     }
 
     delete item;
@@ -301,12 +304,13 @@ void FileTreeModel::clear()
     root_item_ = std::make_unique<FileTreeItem>();
     endResetModel();
 
-    assert(index_cache_.isEmpty());
+    assert(std::empty(index_cache_));
 }
 
 FileTreeItem* FileTreeModel::findItemForFileIndex(int file_index) const
 {
-    return index_cache_.value(file_index, nullptr);
+    auto iter = index_cache_.find(file_index);
+    return iter == std::end(index_cache_) ? nullptr : iter->second;
 }
 
 void FileTreeModel::addFile(

qt/FileTreeModel.h

@@ -6,10 +6,10 @@
 #pragma once
 
 #include <cstdint> // uint64_t
+#include <map>
 #include <memory>
 
 #include <QAbstractItemModel>
-#include <QMap>
 #include <QSet>
 
 #include <libtransmission/tr-macros.h>
@@ -95,7 +95,7 @@ private:
     FileTreeItem* itemFromIndex(QModelIndex const&) const;
     QModelIndexList getOrphanIndices(QModelIndexList const& indices) const;
 
-    QMap<int, FileTreeItem*> index_cache_;
+    std::map<int, FileTreeItem*> index_cache_;
     std::unique_ptr<FileTreeItem> root_item_;
     bool is_editable_ = {};
 };