add specific icon for DOIs - implements #696

CHANGELOG.md

@@ -28,6 +28,7 @@ to [sourceforge feature requests](https://sourceforge.net/p/jabref/features/) by
 - Added an option in the about dialog to easily copy the version information of JabRef
 - Integrity check table can be sorted by clicking on column headings
 - Added \SOFTWARE\Jabref 'Path' registry entry for installation path inside the installer
+- Added an additional icon to distinguish DOI and URL links ([feature request #696](https://github.com/JabRef/jabref/issues/696))
 
 ### Fixed
 - Fixed [#473](https://github.com/JabRef/jabref/issues/473): Values in an entry containing symbols like ' are now properly escaped for exporting to the database

src/main/java/net/sf/jabref/gui/GUIGlobals.java

@@ -145,7 +145,7 @@ public static void init() {
         label.setToolTipText(Localization.lang("Open") + " ArXiv URL");
         GUIGlobals.TABLE_ICONS.put("eprint", label);
 
-        label = new JLabel(IconTheme.JabRefIcon.WWW.getSmallIcon());
+        label = new JLabel(IconTheme.JabRefIcon.DOI.getSmallIcon());
         label.setToolTipText(Localization.lang("Open") + " DOI " + Localization.lang("web link"));
         GUIGlobals.TABLE_ICONS.put("doi", label);
 

src/main/java/net/sf/jabref/gui/IconTheme.java

@@ -87,7 +87,7 @@ public enum JabRefIcon {
         REMOVE_NOBOX("\uf374") /*css: minus */,
         FILE("\uf214"), /* css: file*/
         PDF_FILE("\uf225"), /* css: file-pdf*/
-        DOI("\uf59f") /*css: web*/,
+        DOI("\uF072") /*css: barcode-scan*/,
         DUPLICATE("\uf191") /*css: content-duplicate */,
         EDIT("\uf3eb") /*css: pencil */,
         NEW("\uf224") /* css: file-outline */,