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
 
+- WE changed the tooltop to display all linked Files when hovering instead of only displaying the the first linked file. [#12470](https://github.com/JabRef/jabref/issues/12470)
 - We moved the "Generate a new key for imported entries" option from the "Web search" tab to the "Citation key generator" tab in preferences. [#12436](https://github.com/JabRef/jabref/pull/12436)
 - 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

@@ -139,7 +139,13 @@ 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();
+
+            for (LinkedFile linkedFile : linkedFiles) {
+                tooltipText.append(linkedFile.getLink()).append("\n");
+            }
+
+            return Localization.lang("Open files: \n%0", tooltipText.toString());
         }
         return null;
     }

src/main/resources/l10n/JabRef_en.properties

@@ -1958,7 +1958,7 @@ Move\ panel\ down=Move panel down
 Linked\ files=Linked files
 Group\ view\ mode\ set\ to\ intersection=Group view mode set to intersection
 Group\ view\ mode\ set\ to\ union=Group view mode set to union
-Open\ file\ %0=Open file %0
+Open\ files\:\ \n%0=Open files: \n%0
 Toggle\ intersection=Toggle intersection
 Toggle\ union=Toggle union
 The\ group\ name\ contains\ the\ keyword\ separator\ "%0"\ and\ thus\ probably\ does\ not\ work\ as\ expected.=The group name contains the keyword separator "%0" and thus probably does not work as expected.