[518246] Fix bug when resizing execution from the top side

If the lower bound of an execution is on the limit of the lower bound of
its parent operand, the resize from the top side to top was possible
until 5 pixels. But it should be only be possible for 4 pixels.
Otherwise, there was a bug because the execution is moved above the
start of the operand.

Bug: 518246
Change-Id: I7f7c752e367b739a19cfd11911fadff85a08405f
Signed-off-by: Laurent Redor <laurent.redor@obeo.fr>

1 files changed, 5 insertions, 2 deletions

diff --git a/plugins/org.eclipse.sirius.diagram.sequence.ui/src/org/eclipse/sirius/diagram/sequence/ui/tool/internal/edit/validator/AbstractNodeEventResizeSelectionValidator.java b/plugins/org.eclipse.sirius.diagram.sequence.ui/src/org/eclipse/sirius/diagram/sequence/ui/tool/internal/edit/validator/AbstractNodeEventResizeSelectionValidator.java
index f74060da56..a590c54878 100644
--- a/plugins/org.eclipse.sirius.diagram.sequence.ui/src/org/eclipse/sirius/diagram/sequence/ui/tool/internal/edit/validator/AbstractNodeEventResizeSelectionValidator.java
+++ b/plugins/org.eclipse.sirius.diagram.sequence.ui/src/org/eclipse/sirius/diagram/sequence/ui/tool/internal/edit/validator/AbstractNodeEventResizeSelectionValidator.java
@@ -211,8 +211,11 @@ public class AbstractNodeEventResizeSelectionValidator {
                 }
             }
         } else if (requestQuery.isResizeFromTop()) {
-            // We consider that parent is resize before if needed.
-            okForParent = true;
+            // We consider that parent is resize before if needed. There is just an exception when the execution is just
+            // on the lower bound limit of the operand.
+            if (parent.getVerticalRange().getLowerBound() != RangeHelper.verticalRange(newBounds).getLowerBound()) {
+                okForParent = true;
+            }
         } else if (parent.getValidSubEventsRange().includes(RangeHelper.verticalRange(newBounds))) {
             okForParent = true;
         }