Add mouseDoubleClickEvent to BaseEditMixin for number selection

Improve double click to select functionality from default to allow selecting floating point numbers, etc by parsing the line with the tokenize stdlib module and selecting entire NUMBER tokens.

spyder/widgets/mixins.py

@@ -12,20 +12,23 @@
 """
 
 # Standard library imports
+from io import StringIO
 import os
 import os.path as osp
 import re
 import sre_constants
 import sys
 import textwrap
+from token import NUMBER
+from tokenize import generate_tokens
 
 # Third party imports
 from packaging.version import parse
 from qtpy import QT_VERSION
 from qtpy.QtCore import QPoint, QRegularExpression, Qt, QUrl
 from qtpy.QtGui import (
     QDesktopServices, QFontMetrics, QTextCursor, QTextDocument)
-from qtpy.QtWidgets import QApplication
+from qtpy.QtWidgets import QApplication, QPlainTextEdit, QTextEdit
 from spyder_kernels.utils.dochelpers import (getargspecfromtext, getobj,
                                              getsignaturefromtext)
 
@@ -1498,6 +1501,27 @@ def _enter_array(self, inline):
                 if self.sig_text_was_inserted is not None:
                     self.sig_text_was_inserted.emit()
                 cursor.endEditBlock()
+
+    # ---- Qt methods
+    def mouseDoubleClickEvent(self, event):
+        """select NUMBER tokens to select numeric literals on double click"""
+        cur = self.cursorForPosition(event.pos())
+        block = cur.block()
+        text = block.text()
+        pos = block.position()
+        pos_in_block = cur.positionInBlock()
+        for t_type, _, start, end, _ in generate_tokens(StringIO(text).read):
+            if t_type == NUMBER and start[1] <= pos_in_block <= end[1]:
+                cur.setPosition(pos + start[1])
+                cur.setPosition(pos + end[1], QTextCursor.MoveMode.KeepAnchor)
+                self.setTextCursor(cur)
+                return
+            elif start[1] > pos_in_block:
+                break
+        if isinstance(self, QPlainTextEdit):
+            QPlainTextEdit.mouseDoubleClickEvent(self, event)
+        elif isinstance(self, QTextEdit):
+            QTextEdit.mouseDoubleClickEvent(self, event)
 
 
 class TracebackLinksMixin(object):