python · terryjreedy · Mar 8, 2020 · Mar 6, 2020 · Mar 7, 2020 · Mar 7, 2020
diff --git a/Doc/library/idle.rst b/Doc/library/idle.rst
@@ -142,7 +142,9 @@ Replace...
    Open a search-and-replace dialog.
 
 Go to Line
-   Move cursor to the line number requested and make that line visible.
+   Move the cursor to the beginning of the line requested and make that
+   line visible.  A request past the end of the file goes to the end.
+   Clear any selection and update the line and column status.
 
 Show Completions
    Open a scrollable list allowing selection of keywords and attributes. See

diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
@@ -3,6 +3,9 @@ Released on 2020-10-05?
 ======================================
 
 
+bpo-39852: Edit "Go to line" now clears any selection, preventing
+accidental deletion.  It also updates Ln and Col on the status bar.
+
 bpo-39781: Selecting code context lines no longer causes a jump.
 
 bpo-39663: Add tests for pyparse find_good_parse_start().

diff --git a/Lib/idlelib/editor.py b/Lib/idlelib/editor.py
@@ -678,8 +678,11 @@ def goto_line_event(self, event):
         if lineno <= 0:
             text.bell()
             return "break"
-        text.mark_set("insert", "%d.0" % lineno)
+
+        text.tag_remove("sel", "1.0", "end")
+        text.mark_set("insert", f'{lineno}.0')
         text.see("insert")
+        self.set_line_and_column()
         return "break"
 
     def open_module(self):

diff --git a/Lib/idlelib/help.html b/Lib/idlelib/help.html
@@ -4,7 +4,7 @@
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
     <meta charset="utf-8" />
-    <title>IDLE &#8212; Python 3.9.0a1 documentation</title>
+    <title>IDLE &#8212; Python 3.9.0a4 documentation</title>
     <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
 
@@ -17,7 +17,7 @@
     <script type="text/javascript" src="../_static/sidebar.js"></script>
 
     <link rel="search" type="application/opensearchdescription+xml"
-          title="Search within Python 3.9.0a1 documentation"
+          title="Search within Python 3.9.0a4 documentation"
           href="../_static/opensearch.xml"/>
     <link rel="author" title="About these documents" href="../about.html" />
     <link rel="index" title="Index" href="../genindex.html" />
@@ -71,7 +71,7 @@ <h3>Navigation</h3>
 
 
     <li>
-      <a href="../index.html">3.9.0a1 Documentation</a> &#187;
+      <a href="../index.html">3.9.0a4 Documentation</a> &#187;
     </li>
 
           <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
@@ -197,7 +197,9 @@ <h3>Edit menu (Shell and Editor)<a class="headerlink" href="#edit-menu-shell-and
 </dd>
 <dt>Replace…</dt><dd><p>Open a search-and-replace dialog.</p>
 </dd>
-<dt>Go to Line</dt><dd><p>Move cursor to the line number requested and make that line visible.</p>
+<dt>Go to Line</dt><dd><p>Move the cursor to the beginning of the line requested and make that
+line visible.  A request past the end of the file goes to the end.
+Clear any selection and update the line and column status.</p>
 </dd>
 <dt>Show Completions</dt><dd><p>Open a scrollable list allowing selection of keywords and attributes. See
 <a class="reference internal" href="#completions"><span class="std std-ref">Completions</span></a> in the Editing and navigation section below.</p>
@@ -635,17 +637,20 @@ <h3>Startup failure<a class="headerlink" href="#startup-failure" title="Permalin
 clash, or cannot or does not want to run as admin, it might be easiest to
 completely remove Python and start over.</p>
 <p>A zombie pythonw.exe process could be a problem.  On Windows, use Task
-Manager to detect and stop one.  Sometimes a restart initiated by a program
-crash or Keyboard Interrupt (control-C) may fail to connect.  Dismissing
-the error box or Restart Shell on the Shell menu may fix a temporary problem.</p>
+Manager to check for one and stop it if there is.  Sometimes a restart
+initiated by a program crash or Keyboard Interrupt (control-C) may fail
+to connect.  Dismissing the error box or using Restart Shell on the Shell
+menu may fix a temporary problem.</p>
 <p>When IDLE first starts, it attempts to read user configuration files in
 <code class="docutils literal notranslate"><span class="pre">~/.idlerc/</span></code> (~ is one’s home directory).  If there is a problem, an error
 message should be displayed.  Leaving aside random disk glitches, this can
-be prevented by never editing the files by hand, using the configuration
-dialog, under Options, instead Options.  Once it happens, the solution may
-be to delete one or more of the configuration files.</p>
+be prevented by never editing the files by hand.  Instead, use the
+configuration dialog, under Options.  Once there is an error in a user
+configuration file, the best solution may be to delete it and start over
+with the settings dialog.</p>
 <p>If IDLE quits with no message, and it was not started from a console, try
-starting from a console (<code class="docutils literal notranslate"><span class="pre">python</span> <span class="pre">-m</span> <span class="pre">idlelib</span></code>) and see if a message appears.</p>
+starting it from a console or terminal (<code class="docutils literal notranslate"><span class="pre">python</span> <span class="pre">-m</span> <span class="pre">idlelib</span></code>) and see if
+this results in an error message.</p>
 </div>
 <div class="section" id="running-user-code">
 <h3>Running user code<a class="headerlink" href="#running-user-code" title="Permalink to this headline">¶</a></h3>
@@ -930,7 +935,7 @@ <h3>Navigation</h3>
 
 
     <li>
-      <a href="../index.html">3.9.0a1 Documentation</a> &#187;
+      <a href="../index.html">3.9.0a4 Documentation</a> &#187;
     </li>
 
           <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
@@ -953,15 +958,15 @@ <h3>Navigation</h3>
       </ul>
     </div>
     <div class="footer">
-    &copy; <a href="../copyright.html">Copyright</a> 2001-2019, Python Software Foundation.
+    &copy; <a href="../copyright.html">Copyright</a> 2001-2020, Python Software Foundation.
     <br />
 
     The Python Software Foundation is a non-profit corporation.
 <a href="https://www.python.org/psf/donations/">Please donate.</a>
 <br />
     <br />
 
-    Last updated on Nov 24, 2019.
+    Last updated on Mar 07, 2020.
     <a href="https://docs.python.org/3/bugs.html">Found a bug</a>?
     <br />
 

diff --git a/Misc/NEWS.d/next/IDLE/2020-03-06-01-55-14.bpo-39852.QjA1qF.rst b/Misc/NEWS.d/next/IDLE/2020-03-06-01-55-14.bpo-39852.QjA1qF.rst
@@ -0,0 +1,2 @@
+Edit "Go to line" now clears any selection, preventing accidental deletion.
+It also updates Ln and Col on the status bar.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Edit "Go to line" now clears any selection, preventing accidental deletion.
		It also updates Ln and Col on the status bar.