Bug:Crash Zoomed


 * GA: Experienced on Windows XP in one project that crashed regularly on separate days but now won't do so, also several similar anecdotal reports. There is also an implication that Noise Removal is more likely than other effects to trigger the problem. JC suggested and was agreed we should aim to do stress-testing with small block sizes to try and force the problems to occur and (later added) that we should use the scripting feature to do this (improving our chances that we can repeat the problem).
 * JC: A label issue? (I have not seen this crash yet).
 * GA: Without labels in my case, with in others, so believed that labels not relevant.
 * MJS: There appear to be no recent reports of this bug, and no repeatable evidence. I suggest this is demoted to a 'watching issue'.
 * GA: Initialise blockStatus in Sequence.cpp (8Nov09) and possibly fix for spurious clips at the track end after Change Speed (4Nov09) may have helped some cases, but still reports from one user 5 and 11 Nov09 of clicking to right of a zoomed in selection near the end of a project causing a crash. NB the act of zooming itself does not usually cause a problem. Further changes by AWD 19Nov09 to WaveTrack::ClearAndPaste to help eliminate zero-length clip creation in ChangeSpeed and similar also noted.
 * MJS 23 Nov 09: the thread at http://n2.nabble.com/Various-P2s-and-P3s-a-repeatable-case-td4040974.html gives some insight. This appears to be fixed although Gale has not confirmed that the test cases replicates the original problem.  Since it is a 'moon phase' bug he can't really do that, but I have provided a good case, and Al has addressed the issues, so I think this is fixed.