Use proxy configuration also for HTTPS connections - fixes #2249 (#2418)

* use proxy configuration also for HTTPS connections - fixes #2249

* Add CHANGELOG for #2249 fix

* Fix brackets

CHANGELOG.md

@@ -25,6 +25,9 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
 - We fixed issues with the [timestamp](http://help.jabref.org/en/TimeStamp) field. However, clearing with the clear button is not possible if timestamp format does not match the current settings. Fixes [#2403](https://github.com/JabRef/jabref/issues/2403).
 - Fixes [#2406](https://github.com/JabRef/jabref/issues/2406) so that the integrity check filter works again
 - Closing of subtrees in the groups panel using "close subtree" is working again. Fixes [#2319](https://github.com/JabRef/jabref/issues/2319).
+- The proxy settings are now also applied to HTTPS connections. Fixes [#2249](https://github.com/JabRef/jabref/issues/2249).
+
+
 
 ### Removed
 

src/main/java/net/sf/jabref/logic/net/ProxyRegisterer.java

@@ -8,10 +8,16 @@ public static void register(ProxyPreferences proxyPrefs) {
             System.setProperty("http.proxyHost", proxyPrefs.getHostname());
             System.setProperty("http.proxyPort", proxyPrefs.getPort());
 
+            System.setProperty("https.proxyHost", proxyPrefs.getHostname());
+            System.setProperty("https.proxyPort", proxyPrefs.getPort());
+
             // NetworkTab.java ensures that proxyUsername and proxyPassword are neither null nor empty
             if (proxyPrefs.isUseAuthentication()) {
                 System.setProperty("http.proxyUser", proxyPrefs.getUsername());
                 System.setProperty("http.proxyPassword", proxyPrefs.getPassword());
+
+                System.setProperty("https.proxyUser", proxyPrefs.getUsername());
+                System.setProperty("https.proxyPassword", proxyPrefs.getPassword());
             }
         } else {
             // The following two lines signal that the system proxy settings