modules/javafx.graphics/src/main/java/com/sun/glass/ui/gtk/GtkApplication.java

*** 84,113 ****
              System.out.println(description+val);
          }
          return val;
      }
  
!     GtkApplication() {
  
          // Check whether the Display is valid and throw an exception if not.
          // We use UnsupportedOperationException rather than HeadlessException
          // so as not to introduce a dependency on AWT.
          if (!isDisplayValid()) {
              throw new UnsupportedOperationException("Unable to open DISPLAY");
          }
  
!         int gtkVersion =
                  AccessController.doPrivileged((PrivilegedAction<Integer>) () -> {
              String v = System.getProperty("jdk.gtk.version","2");
              int ret = 0;
              if ("3".equals(v) || v.startsWith("3.")) {
                  ret = 3;
              } else if ("2".equals(v) || v.startsWith("2.")) {
                  ret = 2;
              }
              return ret;
!         });
          boolean gtkVersionVerbose =
                  AccessController.doPrivileged((PrivilegedAction<Boolean>) () -> {
              return Boolean.getBoolean("jdk.gtk.verbose");
          });
          if (PrismSettings.allowHiDPIScaling) {
--- 84,113 ----
              System.out.println(description+val);
          }
          return val;
      }
  
!     GtkApplication(int forcedGtkVersion) {
  
          // Check whether the Display is valid and throw an exception if not.
          // We use UnsupportedOperationException rather than HeadlessException
          // so as not to introduce a dependency on AWT.
          if (!isDisplayValid()) {
              throw new UnsupportedOperationException("Unable to open DISPLAY");
          }
  
!         final int gtkVersion = forcedGtkVersion == 0 ?
              AccessController.doPrivileged((PrivilegedAction<Integer>) () -> {
                  String v = System.getProperty("jdk.gtk.version","2");
                  int ret = 0;
                  if ("3".equals(v) || v.startsWith("3.")) {
                      ret = 3;
                  } else if ("2".equals(v) || v.startsWith("2.")) {
                      ret = 2;
                  }
                  return ret;
!             }) : forcedGtkVersion;
          boolean gtkVersionVerbose =
                  AccessController.doPrivileged((PrivilegedAction<Boolean>) () -> {
              return Boolean.getBoolean("jdk.gtk.verbose");
          });
          if (PrismSettings.allowHiDPIScaling) {