FIx only one linked files showing in tooltip

CHANGELOG.md

@@ -15,6 +15,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 
 ### Changed
 
+- Change Tooltip to display all linked Files when Hovering instead of only displays the First Linked File. [#12470](https://github.com/JabRef/jabref/issues/12470)
 - We improved the offline parsing of BibTeX data from PDF-documents. [#12278](https://github.com/JabRef/jabref/issues/12278)
 - The tab bar is now hidden when only one library is open. [#9971](https://github.com/JabRef/jabref/issues/9971)
 

src/main/java/org/jabref/gui/maintable/columns/FileColumn.java

@@ -139,11 +139,20 @@ private void setCommonSettings() {
 
     private String createFileTooltip(List<LinkedFile> linkedFiles) {
         if (!linkedFiles.isEmpty()) {
-            return Localization.lang("Open file %0", linkedFiles.getFirst().getLink());
+            StringBuilder tooltipText = new StringBuilder();
+
+            // Iterate through all linked files and append their links to the tooltip text
+            for (LinkedFile linkedFile : linkedFiles) {
+                tooltipText.append(linkedFile.getLink()).append("\n"); // Add a new line between each link
+            }
+
+            // Return the concatenated text as a formatted tooltip
+            return Localization.lang("Open files: \n%0", tooltipText.toString());
         }
         return null;
     }
 
+
     private ContextMenu createFileMenu(BibEntryTableViewModel entry, List<LinkedFile> linkedFiles) {
         if (linkedFiles.size() <= 1) {
             return null;