Fix ClassCastException #171

This is a breaking change. RCPTT have icorrectly tried to use
incompatible editing support to extract values, when cell text was
empty. This worked only by accident.

java.lang.ClassCastException: class
org.eclipse.rcptt.ui.panels.assertion.AssertGroup cannot be cast to
class org.eclipse.rcptt.tesla.core.protocol.Assert
(org.eclipse.rcptt.ui.panels.assertion.AssertGroup is in unnamed module
of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @20f015cc;
org.eclipse.rcptt.tesla.core.protocol.Assert is in unnamed module of
loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @2d5f77ed)
	at org.eclipse.rcptt.ui.panels.assertion.AssertOperationEditingSupport.getValue(AssertOperationEditingSupport.java:49)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.eclipse.rcptt.tesla.internal.ui.player.TeslaSWTAccess.callMethod(TeslaSWTAccess.java:426)
	at org.eclipse.rcptt.tesla.internal.ui.player.SWTModelMapper.getColumnValue(SWTModelMapper.java:917)
	at org.eclipse.rcptt.tesla.internal.ui.player.SWTModelMapper.fillTreeItem(SWTModelMapper.java:823)
	at org.eclipse.rcptt.tesla.internal.ui.player.SWTModelMapper.internalMap(SWTModelMapper.java:153)
	at org.eclipse.rcptt.tesla.internal.ui.player.SWTModelMapper.map(SWTModelMapper.java:90)
	at org.eclipse.rcptt.tesla.internal.ui.player.SWTUIElement.getModel(SWTUIElement.java:260)
	at org.eclipse.rcptt.tesla.internal.ui.processors.SWTUIProcessor.handleAssert(SWTUIProcessor.java:1802)
	at org.eclipse.rcptt.tesla.internal.ui.processors.SWTUIProcessor.executeCommand(SWTUIProcessor.java:782)
	at org.eclipse.rcptt.tesla.workbench.texteditor.WorkbenchTexteditorProcessor.executeCommand(WorkbenchTexteditorProcessor.java:305)
	at org.eclipse.rcptt.tesla.internal.core.TeslaProcessorManager.executeCommand(TeslaProcessorManager.java:108)

Author: basilevs

rcpttTests/platform_tests/Recording/GetTooltipsWhenColumnsWithoutText.test

@@ -6,8 +6,8 @@ Element-Type: testcase
 Element-Version: 3.0
 External-Reference: 
 Id: _XS8ZEFqHEeSjvvK1muLiaA
-Runtime-Version: 2.5.5.202404041628
-Save-Time: 3/8/25, 11:12 PM
+Runtime-Version: 2.6.0.qualifier
+Save-Time: 5/9/25, 11:35 PM
 Testcase-Type: ecl
 
 ------=_.content-0a7243a0-75d3-3d5f-9791-539de0e5b7ac
@@ -24,14 +24,12 @@ get-view Tasks | get-tree | get-item 1 -column Priority
     | equals "TODO Auto-generated method stub" | verify-true
 
 with [get-view Tasks | get-tree] {
-    get-item "FIXME Very important action" -column Description | get-property "values['Priority']" | equals 2 
-        | verify-true
-    get-item "FIXME Very important action" -column Description | get-property "values['Completion']" | equals false 
-        | verify-true
-    get-item "TODO Auto-generated method stub" -column Description | get-property "values['Priority']" | equals 1 
-        | verify-true
-    get-item "TODO Auto-generated method stub" -column Description | get-property "values['Completion']" 
-        | equals false | verify-true
+	with [get-item -path "FIXME Very important action" -column Description] {
+    	get-property "cells[1].image.path" | equals "org.eclipse.ui.ide/icons/full/obj16/hprio_tsk.png" | verify-true
+    	get-property "cells[1].image" | equals "" | verify-false
+    }
+    get-item "TODO Auto-generated method stub" -column Description |  get-property "cells[1].image" | equals "" | verify-true
+    
 }
 
 ------=_.content-0a7243a0-75d3-3d5f-9791-539de0e5b7ac--

runtime/tesla/org.eclipse.rcptt.tesla.swt/src/org/eclipse/rcptt/tesla/internal/ui/player/SWTModelMapper.java

@@ -914,9 +914,12 @@ private static Object getColumnValue(org.eclipse.swt.widgets.Widget widget,
 				columnViewer, "editingSupport");
 		Object value = null;
 		if (es != null) {
-			value = TeslaSWTAccess.callMethod(EditingSupport.class, es,
+			if ((Boolean)TeslaSWTAccess.callMethod(EditingSupport.class, es,
+					"canEdit", new Class[] { Object.class }, ((Item) widget).getData())) {
+				value = TeslaSWTAccess.callMethod(EditingSupport.class, es,
 					"getValue", new Class[] { Object.class },
 					((Item) widget).getData());
+			}
 		}
 		return value;
 	}