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[RaiMan <1891605@xxxxxxxxxxxxxxxxxx>]

** Changed in: sikuli
       Status: New => Opinion

** Changed in: sikuli
   Importance: Undecided => Medium

** Changed in: sikuli
     Assignee: (unassigned) => RaiMan (raimund-hocke)

** Changed in: sikuli
    Milestone: None => 2.0.5

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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
  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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