Status: New Owner: ---- Labels: Type-Defect Priority-Medium New issue 913 by benjamin...(a)gmail.com: MorphTreeTransformMorph>>drawSubmorphsOn: race condition http://code.google.com/p/moose-technology/issues/detail?id=913 In my application using Glamour I was often getting a "red square of death". I tracked this down to MorphTreeTransformMorph>>drawSubmorphsOn: where the line "m := submorphs basicAt: row." generates a being a SubscriptOutOfBounds. Part of the cause is that my application is generating update announcements quite fast, but this is also what provided reproducability to be able to track this down. Otherwise this probably only occurs infrequently seemingly at random. I managed to condense this to the following artificial Workspace example. To set up, execute the first three comments (later you can cleanup with the fourth comment), then execute the rest of the script. -------- "Smalltalk at: #TestAnnouncer put: Announcer new ." "Smalltalk at: #TestTree put: (MAContainer new label: 'root')." "Transcript open" "Smalltalk removeKey: #TestAnnouncer ; removeKey: #TestTree" | browser | TestTree := MAContainer new label: 'root'. 1 to: 20 do: [ :x | TestTree add: (MAContainer new label: x) ]. browser := GLMTabulator new. browser column: #one. browser transmit to: #one; andShow: [ :a | a tree updateOn: AnnouncementMockA from: TestAnnouncer ; allExpanded; children: [:x :i | x children ]. ]. browser openOn: TestTree. -------- Then after that has opened, execute the following: ---- [ 10 timesRepeat: [ 101 to: 110 do: [ :y | (TestTree children at: 5) add: (MAContainer new label: y). TestAnnouncer announce: AnnouncementMockA. ]. (TestTree children at: 5) children removeAll . TestAnnouncer announce: AnnouncementMockA. ] ] fork. ---- and the tree list should go red. File in the attached .st file and repeat. Now the tree list doesn't go red. This is likely more an upstream problem with MorphTreeTransformMorph than with Glamour, but Glamour is what I had as my test case. I didn't know how to use MorphTreeTransformMorph directly. I could probably have a go at fixing this myself after some discussion and direction. This was tested in Moose-suite-4-7-beta-20120103. cheers -ben Attachments: MorphTreeTransformMorph-drawSubmorphsOn.st 1.1 KB