reset search hits when entering empty or invalid query

filterwidget.py

@@ -123,6 +123,7 @@ class FilterWidget(QWidget):
         query = self.query_field.text()
         ignore_case = self.ignore_case.isChecked()
         if len(query) == 0:
+            self.filter_model.truncate()
             return
 
         # cancel previous search
@@ -135,7 +136,8 @@ class FilterWidget(QWidget):
             else:
                 regex = re.compile(re.escape(query), flags=flags)
         except:
-            # query was not a valid regex -> abort
+            # query was not a valid regex -> clear search hits, then abort
+            self.filter_model.truncate()
             return
 
         self.filter_task = FilterTask(

logFileModel.py

@@ -55,7 +55,8 @@ class LogFileModel:
                 f.seek(offset)
                 while l := f.readline():
                     new_offset = f.tell()
-                    line = Line(offset, new_offset, l.decode("utf8", errors="ignore").replace("\r", "").replace("\n", ""))
+                    line = Line(offset, new_offset,
+                                l.decode("utf8", errors="ignore").replace("\r", "").replace("\n", ""))
                     # print("%s %s" %(line.byte_offset(), line.line()))
                     if offset < byte_offset:
                         lines_before_offset.append(line)
@@ -87,5 +88,4 @@ class LogFileModel:
 
     def truncate(self):
         with open(self._file, 'a') as f:
-            print("truncating")
             f.truncate(0)