bpo-31860: Make the font sample in the IDLE font configuration dialog editable. (GH-4106) (#4154)

Changes persist while IDLE remains open
(cherry picked from commit ed6554c487fb2403bc88be6deee611c7a4171d33)

3 files changed, 45 insertions, 34 deletions

diff --git a/Lib/idlelib/configdialog.py b/Lib/idlelib/configdialog.py
index cea8558..099f526 100644
--- a/Lib/idlelib/configdialog.py
+++ b/Lib/idlelib/configdialog.py
@@ -189,6 +189,11 @@ class ConfigDialog(Toplevel):
         """
         self.destroy()
 
+    def destroy(self):
+        global font_sample_text
+        font_sample_text = self.fontpage.font_sample.get('1.0', 'end')
+        super().destroy()
+
     def help(self):
         """Create textview for config dialog help.
 
@@ -429,6 +434,35 @@ class ConfigDialog(Toplevel):
 #     def other_methods():
 #         # Define tab-specific behavior.
 
+font_sample_text = (
+    '<ASCII/Latin1>\n'
+    'AaBbCcDdEeFfGgHhIiJj\n1234567890#:+=(){}[]\n'
+    '\u00a2\u00a3\u00a5\u00a7\u00a9\u00ab\u00ae\u00b6\u00bd\u011e'
+    '\u00c0\u00c1\u00c2\u00c3\u00c4\u00c5\u00c7\u00d0\u00d8\u00df\n'
+    '\n<IPA,Greek,Cyrillic>\n'
+    '\u0250\u0255\u0258\u025e\u025f\u0264\u026b\u026e\u0270\u0277'
+    '\u027b\u0281\u0283\u0286\u028e\u029e\u02a2\u02ab\u02ad\u02af\n'
+    '\u0391\u03b1\u0392\u03b2\u0393\u03b3\u0394\u03b4\u0395\u03b5'
+    '\u0396\u03b6\u0397\u03b7\u0398\u03b8\u0399\u03b9\u039a\u03ba\n'
+    '\u0411\u0431\u0414\u0434\u0416\u0436\u041f\u043f\u0424\u0444'
+    '\u0427\u0447\u042a\u044a\u042d\u044d\u0460\u0464\u046c\u04dc\n'
+    '\n<Hebrew, Arabic>\n'
+    '\u05d0\u05d1\u05d2\u05d3\u05d4\u05d5\u05d6\u05d7\u05d8\u05d9'
+    '\u05da\u05db\u05dc\u05dd\u05de\u05df\u05e0\u05e1\u05e2\u05e3\n'
+    '\u0627\u0628\u062c\u062f\u0647\u0648\u0632\u062d\u0637\u064a'
+    '\u0660\u0661\u0662\u0663\u0664\u0665\u0666\u0667\u0668\u0669\n'
+    '\n<Devanagari, Tamil>\n'
+    '\u0966\u0967\u0968\u0969\u096a\u096b\u096c\u096d\u096e\u096f'
+    '\u0905\u0906\u0907\u0908\u0909\u090a\u090f\u0910\u0913\u0914\n'
+    '\u0be6\u0be7\u0be8\u0be9\u0bea\u0beb\u0bec\u0bed\u0bee\u0bef'
+    '\u0b85\u0b87\u0b89\u0b8e\n'
+    '\n<East Asian>\n'
+    '\u3007\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\n'
+    '\u6c49\u5b57\u6f22\u5b57\u4eba\u6728\u706b\u571f\u91d1\u6c34\n'
+    '\uac00\ub0d0\ub354\ub824\ubaa8\ubd64\uc218\uc720\uc988\uce58\n'
+    '\u3042\u3044\u3046\u3048\u304a\u30a2\u30a4\u30a6\u30a8\u30aa\n'
+    )
+
 
 class FontPage(Frame):
 
@@ -494,7 +528,8 @@ class FontPage(Frame):
         frame_font = LabelFrame(
                 self, borderwidth=2, relief=GROOVE, text=' Shell/Editor Font ')
         frame_sample = LabelFrame(
-                self, borderwidth=2, relief=GROOVE, text=' Font Sample ')
+                self, borderwidth=2, relief=GROOVE,
+                text=' Font Sample (Editable) ')
         frame_indent = LabelFrame(
                 self, borderwidth=2, relief=GROOVE, text=' Indentation Width ')
         # frame_font.
@@ -516,36 +551,8 @@ class FontPage(Frame):
                 frame_font_param, variable=self.font_bold,
                 onvalue=1, offvalue=0, text='Bold')
         # frame_sample.
-        sample = (
-            '<ASCII/Latin1>\n'
-            'AaBbCcDdEeFfGgHhIiJj\n1234567890#:+=(){}[]\n'
-            '\u00a2\u00a3\u00a5\u00a7\u00a9\u00ab\u00ae\u00b6\u00bd\u011e'
-            '\u00c0\u00c1\u00c2\u00c3\u00c4\u00c5\u00c7\u00d0\u00d8\u00df\n'
-            '\n<IPA,Greek,Cyrillic>\n'
-            '\u0250\u0255\u0258\u025e\u025f\u0264\u026b\u026e\u0270\u0277'
-            '\u027b\u0281\u0283\u0286\u028e\u029e\u02a2\u02ab\u02ad\u02af\n'
-            '\u0391\u03b1\u0392\u03b2\u0393\u03b3\u0394\u03b4\u0395\u03b5'
-            '\u0396\u03b6\u0397\u03b7\u0398\u03b8\u0399\u03b9\u039a\u03ba\n'
-            '\u0411\u0431\u0414\u0434\u0416\u0436\u041f\u043f\u0424\u0444'
-            '\u0427\u0447\u042a\u044a\u042d\u044d\u0460\u0464\u046c\u04dc\n'
-            '\n<Hebrew, Arabic>\n'
-            '\u05d0\u05d1\u05d2\u05d3\u05d4\u05d5\u05d6\u05d7\u05d8\u05d9'
-            '\u05da\u05db\u05dc\u05dd\u05de\u05df\u05e0\u05e1\u05e2\u05e3\n'
-            '\u0627\u0628\u062c\u062f\u0647\u0648\u0632\u062d\u0637\u064a'
-            '\u0660\u0661\u0662\u0663\u0664\u0665\u0666\u0667\u0668\u0669\n'
-            '\n<Devanagari, Tamil>\n'
-            '\u0966\u0967\u0968\u0969\u096a\u096b\u096c\u096d\u096e\u096f'
-            '\u0905\u0906\u0907\u0908\u0909\u090a\u090f\u0910\u0913\u0914\n'
-            '\u0be6\u0be7\u0be8\u0be9\u0bea\u0beb\u0bec\u0bed\u0bee\u0bef'
-            '\u0b85\u0b87\u0b89\u0b8e\n'
-            '\n<East Asian>\n'
-            '\u3007\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\n'
-            '\u6c49\u5b57\u6f22\u5b57\u4eba\u6728\u706b\u571f\u91d1\u6c34\n'
-            '\uac00\ub0d0\ub354\ub824\ubaa8\ubd64\uc218\uc720\uc988\uce58\n'
-            '\u3042\u3044\u3046\u3048\u304a\u30a2\u30a4\u30a6\u30a8\u30aa\n'
-            )
-        temp_font = tkFont.Font(self, ('courier', 10, 'normal'))
-        self.font_sample = Label(frame_sample, text=sample, font=temp_font)
+        self.font_sample = Text(frame_sample, width=20, height=20)
+        self.font_sample.insert(END, font_sample_text)
         # frame_indent.
         indent_title = Label(
                 frame_indent, justify=LEFT,
@@ -2153,6 +2160,8 @@ alef, \u05d0 and \u0627.  Arabic digits display left to right.  The
 Devanagari and Tamil lines start with digits.  The East Asian lines
 are Chinese digits, Chinese Hanzi, Korean Hangul, and Japanese
 Hiragana and Katakana.
+
+You can edit the font sample. Changes remain until IDLE is closed.
 ''',
     'Highlights': '''
 Highlighting:
diff --git a/Lib/idlelib/idle_test/test_configdialog.py b/Lib/idlelib/idle_test/test_configdialog.py
index dc7f69c..982dc0b 100644
--- a/Lib/idlelib/idle_test/test_configdialog.py
+++ b/Lib/idlelib/idle_test/test_configdialog.py
@@ -44,10 +44,9 @@ def tearDownModule():
     tracers.detach()
     tracers.clear()
     changes.clear()
-    del dialog
     root.update_idletasks()
     root.destroy()
-    del root
+    root = dialog = None
 
 
 class FontPageTest(unittest.TestCase):
@@ -192,6 +191,7 @@ class FontPageTest(unittest.TestCase):
     def test_set_samples(self):
         d = self.page
         del d.set_samples  # Unmask method for test
+        orig_samples = d.font_sample, d.highlight_sample
         d.font_sample, d.highlight_sample = {}, {}
         d.font_name.set('test')
         d.font_size.set('5')
@@ -202,7 +202,7 @@ class FontPageTest(unittest.TestCase):
         d.set_samples()
         self.assertTrue(d.font_sample == d.highlight_sample == expected)
 
-        del d.font_sample, d.highlight_sample
+        d.font_sample, d.highlight_sample = orig_samples
         d.set_samples = Func()  # Re-mask for other tests.
 
 
diff --git a/Misc/NEWS.d/next/IDLE/2017-10-24-16-21-50.bpo-31860.gECuWx.rst b/Misc/NEWS.d/next/IDLE/2017-10-24-16-21-50.bpo-31860.gECuWx.rst
new file mode 100644
index 0000000..a1c115e
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2017-10-24-16-21-50.bpo-31860.gECuWx.rst
@@ -0,0 +1,2 @@
+The font sample in the IDLE configuration dialog is now editable.
+Changes persist while IDLE remains open