change isExpandableNode API signature to accept Item as parameter.

[raghucssit]

We need to let client know that there is an ExpandableNode special item displayed. Instead of using model element we will try to use Item.

Fixes #1044

[github-actions]

Test Results

0 files   -      855  0 suites   - 855   0s ⏱️ - 1h 47m 43s
0 tests  -   7 357  0 ✔️  -   7 201  0 💤  - 156  0 ❌ ±0 
0 runs   - 23 217  0 ✔️  - 22 702  0 💤  - 515  0 ❌ ±0 

Results for commit 65b6ac8. ± Comparison against base commit 0847f8e.

♻️ This comment has been updated with latest results.

[iloveeclipse]

This change breaks JDT UI, so there is an additional PR missing, or do I miss something?

Description	Resource	Path	Location	Type
The method isExpandableNode(Item) in the type ColumnViewer is not applicable for the arguments (Object)	JavaOutlinePage.java	/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor	line 427	Java Problem
The method isExpandableNode(Item) in the type ColumnViewer is not applicable for the arguments (Object)	PackageExplorerPart.java	/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview	line 288	Java Problem

[raghucssit]

with the changes below 2 pr it should work.
#1097
eclipse-jdt/eclipse.jdt.ui#816

Please check this PR after this #1097

[iloveeclipse]

@raghucssit : thanks, I see it now working with #1097 & JDT UI patch.
Please do following:

1. Update the branch on master once Do not inform client listeners for ExpandableNode selection & fix getRawChildren. #1097 is merged (I plan to merge it as soon as build will be green)
2. Apply API tooling patch below:

diff --git a/bundles/org.eclipse.jface/.settings/.api_filters b/bundles/org.eclipse.jface/.settings/.api_filters
index e1a1b47..56b269c 100644
--- a/bundles/org.eclipse.jface/.settings/.api_filters
+++ b/bundles/org.eclipse.jface/.settings/.api_filters
@@ -3,2 +3,8 @@
     <resource path="META-INF/MANIFEST.MF">
+        <filter id="923795461">
+            <message_arguments>
+                <message_argument value="3.32.0"/>
+                <message_argument value="3.31.0"/>
+            </message_arguments>
+        </filter>
         <filter id="926941240">
@@ -10,2 +16,10 @@
     </resource>
+    <resource path="src/org/eclipse/jface/viewers/ColumnViewer.java" type="org.eclipse.jface.viewers.ColumnViewer">
+        <filter id="338792546">
+            <message_arguments>
+                <message_argument value="org.eclipse.jface.viewers.ColumnViewer"/>
+                <message_argument value="isExpandableNode(Object)"/>
+            </message_arguments>
+        </filter>
+    </resource>
     <resource path="src/org/eclipse/jface/viewers/IStructuredSelection.java" type="org.eclipse.jface.viewers.IStructuredSelection">