fix crash when double clicking behind the last char

bigtext.py

@@ -312,10 +312,10 @@ class InnerBigText(QWidget):
             char_in_line = line.column_to_char(column_in_line)
             # 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
+            current_byte = line.byte_offset() + byte_in_line - 1
             # print("%s + %s = %s" % (line.byte_offset(), char_in_line, current_byte))
         else:
-            current_byte = self.model.byte_count()
+            current_byte = self.model.byte_count() - 1
         return current_byte
 
     def _has_selection(self):

logFileModel.py

@@ -81,12 +81,11 @@ class LogFileModel:
         if len(lines) == 0:
             return "", -1, -1
         line: Line = lines[0]
-        if not lines[0].includes_byte(byte_offset):
+        if not line.includes_byte(byte_offset):
             return "", -1, -1
 
         offset_in_line = byte_offset - line.byte_offset()
         char_index = line.byte_index_to_char_index(offset_in_line)
-        # todo char_index may be out of range
         current_char = line.line()[char_index]
         if not self._is_word_char(current_char):
             return current_char, byte_offset, byte_offset + 1