- fixed bug in Tools DB that crashed when a tool is copied

- in Tools Database added a Save Button whose color is changed in Red if the DB was modified and back to default when the DB is saved.
- fixed bug in Tool DB that crashed the app when the Tool Name was modified but there was no tree item (a tool in the list) selected in the Tree widget (list of tools)
- now on tool add and tool copy, the last item (tool, which is the one added) is autoselected; o tool delete always the first item (tool) is selected

FlatCAMDB.py

@@ -1672,6 +1672,12 @@ class ToolsDB2(QtWidgets.QWidget):
         )
         self.buttons_box.addWidget(import_db_btn)
 
+        self.save_db_btn = FCButton(_("Save DB"))
+        self.save_db_btn.setToolTip(
+            _("Save the Tools Database information's.")
+        )
+        self.buttons_box.addWidget(self.save_db_btn)
+
         self.add_tool_from_db = FCButton(_("Add Tool from Tools DB"))
         self.add_tool_from_db.setToolTip(
             _("Add a new tool in the Tools Table of the\n"
@@ -1796,6 +1802,7 @@ class ToolsDB2(QtWidgets.QWidget):
         remove_entry_btn.clicked.connect(self.on_tool_delete)
         export_db_btn.clicked.connect(self.on_export_tools_db_file)
         import_db_btn.clicked.connect(self.on_import_tools_db_file)
+        self.save_db_btn.clicked.connect(self.on_save_db_btn_click)
         # closebtn.clicked.connect(self.accept)
 
         self.add_tool_from_db.clicked.connect(self.on_tool_requested_from_app)
@@ -2026,6 +2033,14 @@ class ToolsDB2(QtWidgets.QWidget):
         # add the new entry to the Tools DB table
         self.update_storage()
         self.build_db_ui()
+
+        # select the last Tree item just added
+        nr_items = self.tree_widget.topLevelItemCount()
+        if nr_items:
+            last_item = self.tree_widget.topLevelItem(nr_items - 1)
+            self.tree_widget.setCurrentItem(last_item)
+            last_item.setSelected(True)
+
         self.app.inform.emit('[success] %s' % _("Tool added to DB."))
 
     def on_tool_copy(self):
@@ -2050,6 +2065,15 @@ class ToolsDB2(QtWidgets.QWidget):
 
         self.update_storage()
         self.build_db_ui()
+
+        # select the last Tree item just added
+        nr_items = self.tree_widget.topLevelItemCount()
+        if nr_items:
+            last_item = self.tree_widget.topLevelItem(nr_items - 1)
+            self.tree_widget.setCurrentItem(last_item)
+            last_item.setSelected(True)
+
+        self.callback_app()
         self.app.inform.emit('[success] %s' % _("Tool copied from Tools DB."))
 
     def on_tool_delete(self):
@@ -2069,6 +2093,14 @@ class ToolsDB2(QtWidgets.QWidget):
 
         self.update_storage()
         self.build_db_ui()
+
+        # select the first Tree item
+        nr_items = self.tree_widget.topLevelItemCount()
+        if nr_items:
+            first_item = self.tree_widget.topLevelItem(0)
+            self.tree_widget.setCurrentItem(first_item)
+            first_item.setSelected(True)
+
         self.app.inform.emit('[success] %s' % _("Tool removed from Tools DB."))
 
     def on_export_tools_db_file(self):
@@ -2167,6 +2199,7 @@ class ToolsDB2(QtWidgets.QWidget):
         for idx in range(self.app.ui.plot_tab_area.count()):
             if self.app.ui.plot_tab_area.tabText(idx) == _("Tools Database"):
                 self.app.ui.plot_tab_area.tabBar.setTabTextColor(idx, QtGui.QColor('black'))
+                self.save_db_btn.setStyleSheet("")
 
                 # Save Tools DB in a file
                 try:
@@ -2181,6 +2214,10 @@ class ToolsDB2(QtWidgets.QWidget):
                 if not silent:
                     self.app.inform.emit('[success] %s' % _("Saved Tools DB."))
 
+    def on_save_db_btn_click(self):
+        self.app.tools_db_changed_flag = False
+        self.on_save_tools_db()
+
     def ui_connect(self):
         # make sure that we don't make multiple connections to the widgets
         self.ui_disconnect()
@@ -2258,6 +2295,8 @@ class ToolsDB2(QtWidgets.QWidget):
         val = self.name_entry.get_value()
 
         item = self.tree_widget.currentItem()
+        if item is None:
+            return
         # I'm setting the value for the second column (designated by 1) because first column holds the ID
         # and second column holds the Name (this behavior is set in the build_ui method)
         item.setData(1, QtCore.Qt.DisplayRole, val)
@@ -2272,7 +2311,8 @@ class ToolsDB2(QtWidgets.QWidget):
         try:
             wdg = self.sender()
 
-            assert isinstance(wdg, QtWidgets.QWidget), "Expected a QWidget got %s" % type(wdg)
+            assert isinstance(wdg, QtWidgets.QWidget) or isinstance(wdg, QtWidgets.QAction), \
+                "Expected a QWidget got %s" % type(wdg)
 
             if wdg is None:
                 return