select word on double click

bigtext.py

@@ -184,6 +184,18 @@ class InnerBigText(QWidget):
             self.selection_highlight.set_end_byte(offset)
             self.update()
 
+    def mouseDoubleClickEvent(self, e: QtGui.QMouseEvent) -> None:
+        if e.buttons() == Qt.MouseButton.LeftButton:
+            offset = self.to_byte_offset(e)
+            (_word, start_byte, end_byte) = self.model.read_word_at(offset)
+            if start_byte >= 0 and end_byte >= 0:
+                self.selection_highlight.set_start(start_byte)
+                self.selection_highlight.set_end_byte(end_byte)
+            else:
+                self.selection_highlight.set_start(offset)
+                self.selection_highlight.set_end_byte(offset)
+            self.update()
+
     def mouseMoveEvent(self, e: QMouseEvent):
 
         if e.buttons() != Qt.MouseButton.LeftButton:
@@ -243,7 +255,7 @@ class InnerBigText(QWidget):
         if line_number < len(self.lines):
             line = self.lines[line_number]
             column_in_line = self.x_pos_to_column(e.pos().x()) + self._left_offset
-            char_in_line = min(column_in_line, line.length())
+            char_in_line = min(column_in_line, line.length() - 1)
             # print("%s in line %s" % (char_in_line, line_number))
             byte_in_line = line.char_index_to_byte(char_in_line)
             current_byte = line.byte_offset() + byte_in_line