Bug 530602 - Followup: remove unused code

While debugging something, I noticed that SWT receives a lot of
'PROPERTY_NOTIFY' events it's not even interested in.

Remove the code that is no longer used after the previous patches.

Change-Id: I0151bfbb0c403a2758743069f3c7479f172379f6
Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.swt/+/182414
Tested-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>
diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/GDK.java b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/GDK.java
index 750fbaa..81fc95c 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/GDK.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/GDK.java
@@ -173,7 +173,6 @@
 	public static final int GDK_POINTER_MOTION_HINT_MASK = 0x8;
 	public static final int GDK_POINTER_MOTION_MASK = 0x4;
 	public static final int GDK_PROPERTY_NOTIFY = 16;
-	public static final int GDK_PROPERTY_CHANGE_MASK = 1 << 16;
 	public static final int GDK_Page_Down = 0xff56;
 	public static final int GDK_Page_Up = 0xff55;
 	public static final int GDK_Pause = 0xff13;
diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java
index 511f6ed..4314faa 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java
@@ -347,7 +347,6 @@
 	public static final byte[] popup_menu = ascii("popup-menu");
 	public static final byte[] populate_popup = ascii("populate-popup");
 	public static final byte[] preedit_changed = ascii("preedit-changed");
-	public static final byte[] property_notify_event = ascii("property-notify-event");
 	public static final byte[] realize = ascii("realize");
 	public static final byte[] row_activated = ascii("row-activated");
 	public static final byte[] row_changed = ascii("row-changed");
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Display.java b/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Display.java
index 517b7a9..5230a70 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Display.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Display.java
@@ -307,7 +307,6 @@
 	long shellHandle;
 	boolean settingsChanged, runSettings;
 	static final int STYLE_UPDATED = 1;
-	static final int PROPERTY_NOTIFY = 2;
 
 	/* Entry focus behaviour */
 	boolean entrySelectOnFocus;
@@ -1268,10 +1267,6 @@
 		long atom = GDK.gdk_atom_intern(atomName, false);
 		GDK.gdk_selection_owner_set(GTK3.gtk_widget_get_window(shellHandle), atom, OS.CurrentTime, false);
 		GDK.gdk_selection_owner_get(atom);
-
-		// No GdkWindow on GTK4
-		GTK3.gtk_widget_add_events (shellHandle, GDK.GDK_PROPERTY_CHANGE_MASK);
-		OS.g_signal_connect (shellHandle, OS.property_notify_event, signalProc, PROPERTY_NOTIFY);
 	}
 
 	latinKeyGroup = findLatinKeyGroup ();