Prevent group expansion arrow from activating group when expanding or…

… collapsing (#8785)

* Prevent group expansion arrow from activating group when expanding or collapsing

* Update solution by picking StackPane that has either arrow or tree-node-disclosure styleclass

* Check secondary mousebutton, then only check if is StackPane class

* Pattern matching to remove unnecessary StackPane cast

* Update equal() to contains() as object could have multiple styles

* Update CHANGELOG.md

* Update CHANGELOG.md

CHANGELOG.md

@@ -22,6 +22,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - Writing BibTeX data into a PDF (XMP) does not write the `file` field.
 - Writing BibTeX data into a PDF (XMP) considers the configured keyword separator (and does not use "," as default any more)
 - The Medline/Pubmed search now also supports the [default fields and operators for searching](https://docs.jabref.org/collect/import-using-online-bibliographic-database#search-syntax). [forum#3554](https://discourse.jabref.org/t/native-pubmed-search/3354)
+- We improved group expansion arrow that prevent it from activating group when expanding or collapsing. [#7982](https://github.com/JabRef/jabref/issues/7982), [#3176](https://github.com/JabRef/jabref/issues/3176)
 
 ### Fixed
 

src/main/java/org/jabref/gui/groups/GroupTreeView.java

@@ -269,6 +269,10 @@ private void initialize() {
                 if (event.getButton() == MouseButton.SECONDARY) {
                     // Prevent right-click to select group
                     event.consume();
+                } else if (event.getTarget() instanceof StackPane pane) {
+                    if (pane.getStyleClass().contains("arrow") || pane.getStyleClass().contains("tree-disclosure-node")) {
+                        event.consume();
+                    }
                 }
             });