Fix cppcheck reported issues (#333)

Fixes: https://github.com/microsoft/PowerToys/issues/266

src/modules/shortcut_guide/overlay_window.cpp

@@ -154,7 +154,7 @@ D2D1_RECT_F D2DOverlaySVG::get_snap_right() const {
 }
 
 
-D2DOverlayWindow::D2DOverlayWindow() : animation(0.3), total_screen({}) {
+D2DOverlayWindow::D2DOverlayWindow() : total_screen({}), animation(0.3) {
   tasklist_thread = std::thread([&] {
     while (running) {
       // Removing <std::mutex> causes C3538 on std::unique_lock lock(mutex); in show(..)
@@ -443,7 +443,6 @@ void render_arrow(D2DSVG& arrow, TasklistButton& button, RECT window, float max_
     // assume button is 25% wider than taller, +10% to make room for each of the arrows that are hidden
     auto render_arrow_width = (int)(button.height * 1.25f * 1.2f);
     auto render_arrow_height = (int)(render_arrow_width * arrow_ratio);
-    auto y_edge = dy == -1 ? button.y : button.y + button.height;
     arrow.resize(button.x + (button.width - render_arrow_width) / 2,
                  dy == -1 ? button.y - render_arrow_height : 0,
                  render_arrow_width, render_arrow_height, 0.95f, max_scale)

src/modules/shortcut_guide/overlay_window.h

@@ -49,7 +49,7 @@ public:
 
 private:
   void animate(int vk_code, int offset);
-  bool show_thumbnail(const RECT& rect_and_scale, double alpha);
+  bool show_thumbnail(const RECT& rect, double alpha);
   void hide_thumbnail();
   virtual void init() override;
   virtual void resize() override;
@@ -78,7 +78,7 @@ private:
   HTHUMBNAIL thumbnail;
   HWND active_window = nullptr;
   D2DOverlaySVG landscape, portrait;
-  D2DOverlaySVG* use_overlay;
+  D2DOverlaySVG* use_overlay = nullptr;
   D2DSVG no_active;
   std::vector<D2DSVG> arrows;
   std::chrono::steady_clock::time_point shown_start_time;

src/modules/shortcut_guide/shortcut_guide.cpp

@@ -70,7 +70,7 @@ void OverlayWindow::set_config(const wchar_t * config) {
     }
     _values.save_to_settings_file();
   }
-  catch (std::exception ex) {
+  catch (std::exception&) {
     // Improper JSON.
   }
 }
@@ -91,7 +91,6 @@ void OverlayWindow::disable() {
   if (_enabled) {
     winkey_popup->hide();
     target_state->exit();
-    int a = 0;
     delete target_state;
     delete winkey_popup;
     target_state = nullptr;
@@ -156,7 +155,7 @@ void OverlayWindow::destroy() {
 void OverlayWindow::init_settings() {
   try {
     PowerToysSettings::PowerToyValues settings =
-      PowerToysSettings::PowerToyValues::load_from_settings_file(get_name());
+      PowerToysSettings::PowerToyValues::load_from_settings_file(OverlayWindow::get_name());
     if (settings.is_int_value(pressTime.name)) {
       pressTime.value = settings.get_int_value(pressTime.name);
     }
@@ -164,7 +163,7 @@ void OverlayWindow::init_settings() {
       overlayOpacity.value = settings.get_int_value(overlayOpacity.name);
     }
   }
-  catch (std::exception ex) {
+  catch (std::exception&) {
     // Error while loading from the settings file. Just let default values stay as they are.
   }
 }

src/modules/shortcut_guide/target_state.cpp

@@ -119,7 +119,7 @@ void TargetState::handle_timeout() {
   std::unique_lock lock(mutex);
   auto wait_time = delay - (std::chrono::system_clock::now() - winkey_timestamp);
   if (events.empty())
-    cv.wait_for(lock, delay);
+    cv.wait_for(lock, wait_time);
   if (state == Exiting)
     return;
   while (!events.empty()) {