bpo-34120: fix IDLE freezing after closing dialogs (GH-8603)

Added missing .grab_release() calls to all places where we call .grab_set().
(cherry picked from commit 10ea9409ce)

Co-authored-by: Tal Einat <taleinat+github@gmail.com>

Lib/idlelib/config_key.py

@@ -235,10 +235,12 @@ def OK(self, event=None):
             return
         if (self.advanced or self.KeysOK(keys)) and self.bind_ok(keys):
             self.result = keys
+        self.grab_release()
         self.destroy()
 
     def Cancel(self, event=None):
         self.result=''
+        self.grab_release()
         self.destroy()
 
     def KeysOK(self, keys):

Lib/idlelib/configdialog.py

@@ -191,6 +191,7 @@ def cancel(self):
     def destroy(self):
         global font_sample_text
         font_sample_text = self.fontpage.font_sample.get('1.0', 'end')
+        self.grab_release()
         super().destroy()
 
     def help(self):

Lib/idlelib/help_about.py

@@ -195,6 +195,7 @@ def display_file_text(self, title, filename, encoding=None):
 
     def ok(self, event=None):
         "Dismiss help_about dialog."
+        self.grab_release()
         self.destroy()
 
 

Lib/idlelib/query.py

@@ -143,6 +143,10 @@ def cancel(self, event=None):  # Do not replace.
         self.result = None
         self.destroy()
 
+    def destroy(self):
+        self.grab_release()
+        super().destroy()
+
 
 class SectionName(Query):
     "Get a name for a config file section name."

Lib/idlelib/textview.py

@@ -91,6 +91,7 @@ def __init__(self, parent, title, text, modal=True,
 
     def ok(self, event=None):
         """Dismiss text viewer dialog."""
+        self.grab_release()
         self.destroy()
 
 

Misc/NEWS.d/next/IDLE/2018-08-01-23-25-38.bpo-34120.HgsIz-.rst

@@ -0,0 +1 @@
+Fix unresponsiveness after closing certain windows and dialogs.