Add "Clear Selection" button (#259)

* Add "Clear Selection" button

* Change clear select keybind to Esc

Author: PencilVoid

tagstudio/src/qt/ts_qt.py

@@ -401,6 +401,12 @@ def start(self) -> None:
         select_all_action.setToolTip("Ctrl+A")
         edit_menu.addAction(select_all_action)
 
+        clear_select_action = QAction("Clear Selection", menu_bar)
+        clear_select_action.triggered.connect(self.clear_select_action_callback)
+        clear_select_action.setShortcut(QtCore.Qt.Key.Key_Escape)
+        clear_select_action.setToolTip("Esc")
+        edit_menu.addAction(clear_select_action)
+
         edit_menu.addSeparator()
 
         manage_file_extensions_action = QAction("Manage File Extensions", menu_bar)
@@ -727,6 +733,14 @@ def select_all_action_callback(self):
         self.set_macro_menu_viability()
         self.preview_panel.update_widgets()
 
+    def clear_select_action_callback(self):
+        self.selected.clear()
+        for item in self.item_thumbs:
+            item.thumb_button.set_selected(False)
+
+        self.set_macro_menu_viability()
+        self.preview_panel.update_widgets()
+
     def show_tag_database(self):
         self.modal = PanelModal(
             TagDatabasePanel(self.lib), "Library Tags", "Library Tags", has_save=False