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[RaiMan <1891605@xxxxxxxxxxxxxxxxxx>]

--- reg.observe(10) it should stop automatically after 10 second
... correct --- I will check

--- it still don't throw an exception in case there is an error within the handler function.
... an example would be helpful

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https://bugs.launchpad.net/bugs/1891605

Title:
  Observe Region cannot be unregistered

Status in Sikuli:
  Opinion

Bug description:
  Hi!

  I am using Sikulix 2.0.4 on Windows 10 64bit, 2 Monitors.

  The script:
  def testobserve():
      Reg=Region(1,234,2049,1154)

      Reg.onChange(160, testA)
      Reg.observe(3)
      wait(10)
      Reg.stopObserver()  #does not change behavior if this line is there

      Reg.onChange(160, testB)
      Reg.observe(3)

  def testA(event):
         print "TESTA"
         #repeat(20)  does not change behavior if this line is there

  def testB(event):
         print_l "TESTB"
         #repeat(20)  does not change behavior if this line is there
  testobserve()

  results in: (on a continuously changing area)
  TESTA
  TESTA
  TESTA
  TESTA
  TESTA
  TESTA
  TESTA
  TESTB
  TESTA
  TESTB
  TESTA
  TESTB
  TESTA
  TESTB
  TESTA
  TESTB
  TESTA
  TESTB
  TESTA
  TESTB
  TESTA
  TESTB
  TESTA
  TESTB

  Bug 1)  My understanding is that after the first Reg.observe(3) a new function is registered, and the "old" one will be dropped. But it seems that both functions are registered at the same time, which causes some strange effects. (A-B-A-B-A..)
    Workaround: New Region for every handler
  Bug 2) In case there is an error in one of the handler-functions, it breaks without error message
  Bug 3) cannot be seen in this example, but I try to explain. When done like above (adding registered handlers) also the found areas drift away. this means after 2-3 added registrations the areas dont match the changed area anymore. it goes so far to match changes outside the screen, which causes error messages (but not exceptions). by using new assigned regions, this behavior goes away, and all works like expected. (this might be related to an IDE bug I am going to open, where the editor window jumps around - sometimes)
  Suggestion 1) onChange is really nice, but the buggy observer functions are making me crazy. what about a function like exists(pic,sec) to wait for changes on a Region

  Thanks in advance
  Michael

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