diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index 021e1f7710e..0651b3d68dc 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -3,6 +3,8 @@ Released on 2020-10-05?
 ======================================
 
 
+bpo-39781: Selecting code context lines no longer causes a jump.
+
 bpo-39663: Add tests for pyparse find_good_parse_start().
 
 bpo-39600: Remove duplicate font names from configuration list.
diff --git a/Lib/idlelib/codecontext.py b/Lib/idlelib/codecontext.py
index 4ce98136fe4..989b30e5994 100644
--- a/Lib/idlelib/codecontext.py
+++ b/Lib/idlelib/codecontext.py
@@ -7,7 +7,6 @@ the lines which contain the block opening keywords, e.g. 'if', for the
 enclosing block.  The number of hint lines is determined by the maxlines
 variable in the codecontext section of config-extensions.def. Lines which do
 not open blocks are not shown in the context hints pane.
-
 """
 import re
 from sys import maxsize as INFINITY
@@ -17,8 +16,8 @@ from tkinter.constants import NSEW, SUNKEN
 
 from idlelib.config import idleConf
 
-BLOCKOPENERS = {"class", "def", "elif", "else", "except", "finally", "for",
-                "if", "try", "while", "with", "async"}
+BLOCKOPENERS = {'class', 'def', 'if', 'elif', 'else', 'while', 'for',
+                 'try', 'except', 'finally', 'with', 'async'}
 
 
 def get_spaces_firstword(codeline, c=re.compile(r"^(\s*)(\w*)")):
@@ -84,7 +83,7 @@ class CodeContext:
         if self.t1 is not None:
             try:
                 self.text.after_cancel(self.t1)
-            except tkinter.TclError:
+            except tkinter.TclError:  # pragma: no cover
                 pass
             self.t1 = None
 
@@ -112,7 +111,7 @@ class CodeContext:
                 padx += widget.tk.getint(info['padx'])
                 padx += widget.tk.getint(widget.cget('padx'))
                 border += widget.tk.getint(widget.cget('border'))
-            self.context = tkinter.Text(
+            context = self.context = tkinter.Text(
                 self.editwin.text_frame,
                 height=1,
                 width=1,  # Don't request more than we get.
@@ -120,11 +119,11 @@ class CodeContext:
                 padx=padx, border=border, relief=SUNKEN, state='disabled')
             self.update_font()
             self.update_highlight_colors()
-            self.context.bind('<ButtonRelease-1>', self.jumptoline)
+            context.bind('<ButtonRelease-1>', self.jumptoline)
             # Get the current context and initiate the recurring update event.
             self.timer_event()
             # Grid the context widget above the text widget.
-            self.context.grid(row=0, column=1, sticky=NSEW)
+            context.grid(row=0, column=1, sticky=NSEW)
 
             line_number_colors = idleConf.GetHighlight(idleConf.CurrentTheme(),
                                                        'linenumber')
@@ -215,18 +214,25 @@ class CodeContext:
         self.context['state'] = 'disabled'
 
     def jumptoline(self, event=None):
-        "Show clicked context line at top of editor."
-        lines = len(self.info)
-        if lines == 1:  # No context lines are showing.
-            newtop = 1
-        else:
-            # Line number clicked.
-            contextline = int(float(self.context.index('insert')))
-            # Lines not displayed due to maxlines.
-            offset = max(1, lines - self.context_depth) - 1
-            newtop = self.info[offset + contextline][0]
-        self.text.yview(f'{newtop}.0')
-        self.update_code_context()
+        """ Show clicked context line at top of editor.
+
+        If a selection was made, don't jump; allow copying.
+        If no visible context, show the top line of the file.
+        """
+        try:
+            self.context.index("sel.first")
+        except tkinter.TclError:
+            lines = len(self.info)
+            if lines == 1:  # No context lines are showing.
+                newtop = 1
+            else:
+                # Line number clicked.
+                contextline = int(float(self.context.index('insert')))
+                # Lines not displayed due to maxlines.
+                offset = max(1, lines - self.context_depth) - 1
+                newtop = self.info[offset + contextline][0]
+            self.text.yview(f'{newtop}.0')
+            self.update_code_context()
 
     def timer_event(self):
         "Event on editor text widget triggered every UPDATEINTERVAL ms."
diff --git a/Lib/idlelib/idle_test/test_codecontext.py b/Lib/idlelib/idle_test/test_codecontext.py
index 3ec49e97af6..9578cc731a6 100644
--- a/Lib/idlelib/idle_test/test_codecontext.py
+++ b/Lib/idlelib/idle_test/test_codecontext.py
@@ -332,6 +332,14 @@ class CodeContextTest(unittest.TestCase):
         jump()
         eq(cc.topvisible, 8)
 
+        # Context selection stops jump.
+        cc.text.yview('5.0')
+        cc.update_code_context()
+        cc.context.tag_add('sel', '1.0', '2.0')
+        cc.context.mark_set('insert', '1.0')
+        jump()  # Without selection, to line 2.
+        eq(cc.topvisible, 5)
+
     @mock.patch.object(codecontext.CodeContext, 'update_code_context')
     def test_timer_event(self, mock_update):
         # Ensure code context is not active.
diff --git a/Misc/NEWS.d/next/IDLE/2020-02-27-22-17-09.bpo-39781.bbYBeL.rst b/Misc/NEWS.d/next/IDLE/2020-02-27-22-17-09.bpo-39781.bbYBeL.rst
new file mode 100644
index 00000000000..4ae0defc2e2
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2020-02-27-22-17-09.bpo-39781.bbYBeL.rst
@@ -0,0 +1 @@
+Selecting code context lines no longer causes a jump.