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1) use File->Import Existing Projects into Workspace to import the attached projects 2) Run and note view not visible in Java Perspective (as expected) 3) Enable the "C Category Relend Perspective" capability 4) Note that the view is STILL not visible in the Java Perspective (the bug) 5) Reset the Java perspective and note the view does appear There is some code added in ModeledPageLayout by a patch for bug 355497 that hooks identifierListeners when a perspective is is created. These listeners are hooked on views that are in the perspective but are not rendered. They listen for activity enablement changes to render the view when necessary. I suspect the cause for this problem is that the code in ModeleledPageLayout is not being called when the initial layout is loaded on startup from the model. This also causes the problem when the perspective is saved with filtered views, and the restarted workbench will not show the views when the capability is enabled.
Created attachment 205563 [details] Projects demonstrating problem
In 3.x, activities would not make an existing view disappear if its activity was false, nor would it make a filtered view appear if the activity was suddenly enabled. PW
Perhaps I didn't describe the initial behaviour properly? This is what I am seeing on: Version: 3.7.1 Build id: M20110909-1335 Which is NOT happening in e4. Using the test bundles attached to this defect. 1) Open a clean workspace. 2) It opens with the Java Perspective, no added view because the capability is not active. 3) Use Windows->Preferences->General->Capabilities to activate the "C Category Releng Perspective 3" capability At this point the "Sample View" view appears to the right of out Outline view I agree that this view does not, and should not disappear if the capability is subsequently deactivated. However, having a view that is not displayed because it is being filtered by an inactive capability appear when that capability is subsequently enabled seems like proper and desired behaviour. So are we talking about the same thing here or does "if the activity was suddenly enabled." from comment 2 mean a different set of steps that what I describe?
Created attachment 205737 [details] Patch
Released as http://git.eclipse.org/c/platform/eclipse.platform.ui.git/commit/?id=5e15d8954551428c720c68600403d5ceb8fc74b6 Thanx Dean. PW
Verified in I20111205-2330
