bpo-42370: Check element before making mouse click in ttk tests (GH-23491)

(cherry picked from commit b0b4285)

Co-authored-by: Serhiy Storchaka <[email protected]>

Author: miss-islington

Lib/tkinter/test/test_ttk/test_widgets.py

@@ -435,11 +435,12 @@ def test_height(self):
 
     def _show_drop_down_listbox(self):
         width = self.combo.winfo_width()
-        self.combo.event_generate('<ButtonPress-1>', x=width - 5, y=5)
-        self.combo.event_generate('<ButtonRelease-1>', x=width - 5, y=5)
+        x, y = width - 5, 5
+        self.assertRegex(self.combo.identify(x, y), r'.*downarrow\Z')
+        self.combo.event_generate('<ButtonPress-1>', x=x, y=y)
+        self.combo.event_generate('<ButtonRelease-1>', x=x, y=y)
         self.combo.update_idletasks()
 
-
     def test_virtual_event(self):
         success = []
 
@@ -1085,6 +1086,7 @@ def test_traversal(self):
 
         self.nb.select(0)
 
+        self.assertEqual(self.nb.identify(5, 5), 'focus')
         simulate_mouse_click(self.nb, 5, 5)
         self.nb.focus_force()
         self.nb.event_generate('<Control-Tab>')
@@ -1099,6 +1101,7 @@ def test_traversal(self):
         self.nb.tab(self.child1, text='a', underline=0)
         self.nb.enable_traversal()
         self.nb.focus_force()
+        self.assertEqual(self.nb.identify(5, 5), 'focus')
         simulate_mouse_click(self.nb, 5, 5)
         if sys.platform == 'darwin':
             self.nb.event_generate('<Option-a>')
@@ -1129,6 +1132,7 @@ def _click_increment_arrow(self):
         height = self.spin.winfo_height()
         x = width - 5
         y = height//2 - 5
+        self.assertRegex(self.spin.identify(x, y), r'.*uparrow\Z')
         self.spin.event_generate('<ButtonPress-1>', x=x, y=y)
         self.spin.event_generate('<ButtonRelease-1>', x=x, y=y)
         self.spin.update_idletasks()
@@ -1138,6 +1142,7 @@ def _click_decrement_arrow(self):
         height = self.spin.winfo_height()
         x = width - 5
         y = height//2 + 4
+        self.assertRegex(self.spin.identify(x, y), r'.*downarrow\Z')
         self.spin.event_generate('<ButtonPress-1>', x=x, y=y)
         self.spin.event_generate('<ButtonRelease-1>', x=x, y=y)
         self.spin.update_idletasks()
@@ -1526,6 +1531,9 @@ def test_heading(self):
 
     def test_heading_callback(self):
         def simulate_heading_click(x, y):
+            if tcl_version >= (8, 6):
+                self.assertEqual(self.tv.identify_column(x), '#0')
+                self.assertEqual(self.tv.identify_region(x, y), 'heading')
             simulate_mouse_click(self.tv, x, y)
             self.tv.update()