Progress/Activity indicator does not get cleared

[Juan Pablo Caram]

Seems like sometimes clearing the progress bar happens before it gets set to the last state. Perhaps a Progress class can handle this better.

[Juan Pablo Caram]

The progress bar is being replaced with a busy indicator. The original problem was caused by a process breaking (exception thrown) and never reaching the line where the progress bar was cleared or set to 100%.

The new mechanism is based on objects that will call a distructor method when their reference is lost. A central storage keeps a "weak reference", which does not prevent the distructor from being called.

[Juan Pablo Caram]

Attempting to read the file: /home/jpcaram/flatcam_test_files/board_outline.gbr.fab.gbr

[WARNING] Line ignored (1905): X348350Y551000D02*X349100Y550250D01*
[WARNING] Line ignored (1908): Y555500D02*Y551000D01*
[ERROR] PARSING FAILED. Line 1909: M02*
[ERROR][Dummy-2] KeyError(None,)
Line 1909: M02*
Traceback (most recent call last):
  File "/home/jpcaram/flatcam/FlatCAMWorker.py", line 32, in do_worker_task
    task['fcn'](*task['params'])
  File "/home/jpcaram/flatcam/FlatCAMApp.py", line 1590, in open_gerber
    self.new_object("gerber", name, obj_init)
  File "/home/jpcaram/flatcam/FlatCAMApp.py", line 776, in new_object
    initialize(obj, self)
  File "/home/jpcaram/flatcam/FlatCAMApp.py", line 1572, in obj_init
    gerber_obj.parse_file(filename, follow=follow)
  File "/home/jpcaram/flatcam/camlib.py", line 1429, in parse_file
    self.parse_lines(gstr, follow=follow)
  File "/home/jpcaram/flatcam/camlib.py", line 1928, in parse_lines
    raise ParseError("%s\nLine %d: %s" % (repr(err), line_num, gline))
camlib.ParseError: KeyError(None,)
Line 1909: M02*

Failure message is shown in task bar: "Failed to parse file...", but busy indicator still active and showing "Opening Gerber".

[Juan Pablo Caram]

Updated title to better reflect current state of development.

[Juan Pablo Caram]

Using a combination of exception handling and context managers to avoid problems. No clear generic solution yet.

[Juan Pablo Caram]

No issues lately.