Show pdf icon for mime type in maintable (JabRef#8935)

Fixes JabRef#8930

CHANGELOG.md

@@ -19,7 +19,8 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 
 ### Changed
 
-- Change in the color of the selection entries and the color of the summary in the Import Entries Dialog. [#7927](https://github.com/JabRef/jabref/issues/7927)
+- The file column in the main table now shows the corresponding defined icon for the linked file [8930](https://github.com/JabRef/jabref/issues/8930).
+- We improved the color of the selected entries and the color of the summary in the Import Entries Dialog in the dark theme. [#7927](https://github.com/JabRef/jabref/issues/7927)
 - We upgraded to Lucene 9.2 for the fulltext search.
   Thus, the now created search index cannot be read from older versions of JabRef anylonger.
   ⚠️ JabRef will recreate the index in a new folder for new files and this will take a long time for a huge library.
@@ -37,6 +38,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 
 ### Fixed
 
+- We fixed an issue where linked files with the filetype "application/pdf" in an entry were not shown with the correct PDF-Icon in the main table [8930](https://github.com/JabRef/jabref/issues/8930)
 - We fixed an issue where "open folder" for linked files did not open the folder and did not select the file unter certain Linux desktop environments [#8679](https://github.com/JabRef/jabref/issues/8679), [#8849](https://github.com/JabRef/jabref/issues/8849)
 - We fixed an issue where the content of a big shared database library is not shown [#8788](https://github.com/JabRef/jabref/issues/8788)
 - We fixed the unnecessary horizontal scroll bar in group panel [#8467](https://github.com/JabRef/jabref/issues/8467)

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

@@ -147,7 +147,7 @@ private Node createFileIcon(List<LinkedFile> linkedFiles) {
         if (linkedFiles.size() > 1) {
             return IconTheme.JabRefIcons.FILE_MULTIPLE.getGraphicNode();
         } else if (linkedFiles.size() == 1) {
-            return externalFileTypes.fromLinkedFile(linkedFiles.get(0), false)
+            return externalFileTypes.fromLinkedFile(linkedFiles.get(0), true)
                                     .map(ExternalFileType::getIcon)
                                     .orElse(IconTheme.JabRefIcons.FILE)
                                     .getGraphicNode();