[EGIT PATCH] Circument situations where Eclipse tries to decorate resources that do not exist

[Robin Rosenberg <robin.rosenberg@dewire.com>]

This happens when the workspace has not been refreshed properly, e.g.
when switching branches behind Eclipse's back.

Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>
---
 .../internal/decorators/GitResourceDecorator.java  |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

This one seems hard to replicate though I think it shouldn't. Maybe Eclipse refereshes on demand
sometime and sometimes not.  This stacktrace suggests this is the right thing to do.

java.lang.RuntimeException: Resource decorator failed to load tree contents on demand.
        at org.spearce.egit.ui.internal.decorators.GitResourceDecorator.decorate(GitResourceDecorator.java:347)
        at org.eclipse.ui.internal.decorators.LightweightDecoratorDefinition.decorate(LightweightDecoratorDefinition.java:253)
        at org.eclipse.ui.internal.decorators.LightweightDecoratorManager$LightweightRunnable.run(LightweightDecoratorManager.java:71)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
        at org.eclipse.core.runtime.Platform.run(Platform.java:857)
        at org.eclipse.ui.internal.decorators.LightweightDecoratorManager.decorate(LightweightDecoratorManager.java:336)
        at org.eclipse.ui.internal.decorators.LightweightDecoratorManager.getDecorations(LightweightDecoratorManager.java:322)
        at org.eclipse.ui.internal.decorators.DecorationScheduler$1.ensureResultCached(DecorationScheduler.java:369)
        at org.eclipse.ui.internal.decorators.DecorationScheduler$1.run(DecorationScheduler.java:329)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: org.eclipse.core.internal.resources.ResourceException: Resource '/org.spearce.jgit/src/org/spearce/jgit/stgit' does not exist.
        at org.eclipse.core.internal.resources.Resource.checkExists(Resource.java:310)
        at org.eclipse.core.internal.resources.Resource.checkAccessible(Resource.java:193)
        at org.eclipse.core.internal.resources.Resource.getSessionProperty(Resource.java:1079)
        at org.spearce.egit.ui.internal.decorators.GitResourceDecorator.decorate(GitResourceDecorator.java:246)
        ... 9 more

-- robin

diff --git a/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/decorators/GitResourceDecorator.java b/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/decorators/GitResourceDecorator.java
index 7eb008b..d0f9864 100644
--- a/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/decorators/GitResourceDecorator.java
+++ b/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/decorators/GitResourceDecorator.java
@@ -225,6 +225,13 @@ public class GitResourceDecorator extends LabelProvider implements
 		if (rsrc == null)
 			return;
 
+		// If the workspace has not been refreshed properly a resource might
+		// not actually exist, so we ignore these and do not decorate them
+		if (!rsrc.exists() && !rsrc.isPhantom()) {
+			Activator.trace("Tried to decorate non-existent resource "+rsrc);
+			return;
+		}
+
 		RepositoryMapping mapped = RepositoryMapping.getMapping(rsrc);
 
 		Activator.trace("decorate: " + element);
-- 
1.5.4.3