4 files changed, 10 insertions, 4 deletions
diff --git a/plugins/org.eclipse.emf.diffmerge.ui/icons/full/checked_disabled.gif b/plugins/org.eclipse.emf.diffmerge.ui/icons/full/checked_disabled.gif
new file mode 100644
index 00000000..36546f13
--- /dev/null
+++ b/plugins/org.eclipse.emf.diffmerge.ui/icons/full/checked_disabled.gif
diff --git a/plugins/org.eclipse.emf.diffmerge.ui/icons/full/unchecked_disabled.gif b/plugins/org.eclipse.emf.diffmerge.ui/icons/full/unchecked_disabled.gif
new file mode 100644
index 00000000..b6cffcb6
--- /dev/null
+++ b/plugins/org.eclipse.emf.diffmerge.ui/icons/full/unchecked_disabled.gif
diff --git a/plugins/org.eclipse.emf.diffmerge.ui/src/org/eclipse/emf/diffmerge/ui/EMFDiffMergeUIPlugin.java b/plugins/org.eclipse.emf.diffmerge.ui/src/org/eclipse/emf/diffmerge/ui/EMFDiffMergeUIPlugin.java
index e18c89ab..9aa7bdb5 100644
--- a/plugins/org.eclipse.emf.diffmerge.ui/src/org/eclipse/emf/diffmerge/ui/EMFDiffMergeUIPlugin.java
+++ b/plugins/org.eclipse.emf.diffmerge.ui/src/org/eclipse/emf/diffmerge/ui/EMFDiffMergeUIPlugin.java
@@ -55,10 +55,11 @@ public class EMFDiffMergeUIPlugin extends AbstractUIPlugin {
   /** Identifiers for UI images */
   @SuppressWarnings("javadoc")
   public static enum ImageID {
-    CHECKED, CHECKIN_ACTION, CHECKOUT_ACTION, COLLAPSEALL, CONFLICT_STAT, DELETE, DOWN,
-    EMPTY, EXPANDALL, FILTER, INC_STAT, INC_ADD_STAT, INC_REM_STAT, LEFT, LOCK, MODIFIED_STAT,
+    CHECKED, CHECKED_DISABLED, CHECKIN_ACTION, CHECKOUT_ACTION, COLLAPSEALL, CONFLICT_STAT, DELETE,
+    DOWN, EMPTY, EXPANDALL, FILTER, INC_STAT, INC_ADD_STAT, INC_REM_STAT, LEFT, LOCK, MODIFIED_STAT,
     NEXT_CHANGE_NAV, NEXT_DIFF_NAV, OUT_STAT, OUT_ADD_STAT, OUT_REM_STAT, PLUS, PREV_CHANGE_NAV,
-    PREV_DIFF_NAV, REDO, RIGHT, SHOW, SORT, SWAP, SYNCED, TREE, UNCHECKED, UNDO, UP, VIEW_MENU, WARNING }
+    PREV_DIFF_NAV, REDO, RIGHT, SHOW, SORT, SWAP, SYNCED, TREE, UNCHECKED, UNCHECKED_DISABLED, UNDO,
+    UP, VIEW_MENU, WARNING }
   
   /** Identifiers for colors according to the side to which a difference presence is relative */
   @SuppressWarnings("javadoc")
diff --git a/plugins/org.eclipse.emf.diffmerge.ui/src/org/eclipse/emf/diffmerge/ui/viewers/CategoryViewer.java b/plugins/org.eclipse.emf.diffmerge.ui/src/org/eclipse/emf/diffmerge/ui/viewers/CategoryViewer.java
index 515ebdff..92ff8a62 100644
--- a/plugins/org.eclipse.emf.diffmerge.ui/src/org/eclipse/emf/diffmerge/ui/viewers/CategoryViewer.java
+++ b/plugins/org.eclipse.emf.diffmerge.ui/src/org/eclipse/emf/diffmerge/ui/viewers/CategoryViewer.java
@@ -475,7 +475,12 @@ public class CategoryViewer extends Viewer {
       Image result = null;
       if (element_p instanceof IDifferenceCategory) {
         IDifferenceCategory cat = (IDifferenceCategory)element_p;
-        ImageID imageId = (isSelected(cat))? ImageID.CHECKED: ImageID.UNCHECKED;
+        boolean selected = isSelected(cat);
+        ImageID imageId;
+        if (cat.isModifiable())
+          imageId = selected? ImageID.CHECKED: ImageID.UNCHECKED;
+        else
+          imageId = selected? ImageID.CHECKED_DISABLED: ImageID.UNCHECKED_DISABLED;
         result = EMFDiffMergeUIPlugin.getDefault().getImage(imageId);
       }
       return result;