Merge remote-tracking branch 'upstream/master' into selectFilesDlg

* upstream/master:
  Improve SyncLang.py (#3184)
  Config intellj code style to adhere to empty lines checkstyle rule (#3365)
  Don't list same look and feels more than once (#3393)
  progessdialog and result table are now shown correclty on copy files
  Export pdf/linked files  (#3147)
  Added checking integrity dialog (#3388)

Author: Siedlerchr

CHANGELOG.md

@@ -23,9 +23,10 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
 - We now set the WM_CLASS of the UI to org-jabref-JabRefMain to allow certain Un*x window managers to properly identify its windows
 - We changed the default paths for the OpenOffice/LibreOffice binaries to the default path for LibreOffice
 - We no longer create a new entry editor when selecting a new entry to increase performance. [#3187](https://github.com/JabRef/jabref/pull/3187)
+- We added the possibility to copy linked files from entries to a single output folder [#2539](https://github.com/JabRef/jabref/pull/2593)
 - We increased performance and decreased the memory footprint of the entry editor drastically. [#3331](https://github.com/JabRef/jabref/pull/3331)
 - Late initialization of the context menus in the entry editor. This improves performance and memory footprint further [#3340](https://github.com/JabRef/jabref/pull/3340)
-
+- We added a dialog to show that JabRef is working on checking integrity. [#3358](https://github.com/JabRef/jabref/issues/3358)
 
 ### Fixed
  - We fixed the translation of \textendash in the entry preview [#3307](https://github.com/JabRef/jabref/issues/3307)
@@ -38,6 +39,7 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
  - We fixed an issue where editing in the source tab would override content of other entries [#3352](https://github.com/JabRef/jabref/issues/3352#issue-268580818)
  - We fixed several issues with the automatic linking of files in the entry editor where files were not found or not correctly saved in the bibtex source [#3346](https://github.com/JabRef/jabref/issues/3346)
  - We fixed an issue where fetching entries from crossref that had no titles caused an error [#3376](https://github.com/JabRef/jabref/issues/3376)
+ - We fixed an issue where the same Java Look and Feel would be listed more than once in the Preferences. [#3391](https://github.com/JabRef/jabref/issues/3391)
 
  ### Removed
 

config/IntelliJ Code Style.xml

@@ -1,4 +1,4 @@
-<code_scheme name="Project copy">
+<code_scheme name="JabRef">
   <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
   <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="999" />
   <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
@@ -28,6 +28,8 @@
     <option name="DO_NOT_WRAP_AFTER_SINGLE_ANNOTATION" value="true" />
   </JavaCodeStyleSettings>
   <codeStyleSettings language="JAVA">
+    <option name="KEEP_BLANK_LINES_IN_DECLARATIONS" value="1" />
+    <option name="KEEP_BLANK_LINES_IN_CODE" value="1" />
     <option name="KEEP_BLANK_LINES_BEFORE_RBRACE" value="0" />
     <arrangement>
       <rules>
@@ -289,4 +291,4 @@
       </rules>
     </arrangement>
   </codeStyleSettings>
-</code_scheme>
+</code_scheme>