respect range limit when searching

src/plugins/logfile/filterwidget.py

@@ -68,12 +68,19 @@ class FilterTask(QRunnable):
             last_progress_report = time.time()
             try:
                 with open(self.source_model.get_file(), "rb") as source:
+                    source.seek(self.source_model.range_start)
+                    source_position = source.tell()
                     with open(self.filter_model.get_file(), "w+b") as target:
                         line_count = 0
                         lines_written = 0
                         while line_encoded := source.readline():
+                            if 0 < self.source_model.range_end < source_position:
+                                break
+
                             line_count = line_count + 1
+
                             line = line_encoded.decode("utf8", errors="ignore")
+                            source_position = source_position + len(line_encoded)
 
                             if self.regex.findall(line):
                                 lines_written = lines_written + 1