Bug 575814 - [GTK4] Restore default sizing if no setBounds/Size used

This patch restores equivalent functionality to GTK3 to shells that are
opened without calling setBounds or setSize.


Change-Id: I64ef437f309b89f7b832f79a4a5457dd0317bc47
Signed-off-by: jmajano <[email protected]>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.swt/+/185564
Tested-by: Platform Bot <[email protected]>
Reviewed-by: Alexander Kurtakov <[email protected]>

Author: joel-majano

bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Display.java

@@ -6143,11 +6143,22 @@ void leaveProc(long controller, long user_data) {
 void computeSizeProc(long toplevel, long size, long user_data) {
 	Shell shell = (Shell)getWidget(user_data);
 	if(shell == null) return;
-	if(windowSizeSet && !shell.geometry.getResize() ) return;
-	GTK4.gdk_toplevel_size_set_size(size,shell.geometry.getRequestedWidth(),shell.geometry.getRequestedHeight() );
+	if(shell.geometry.getResize()) {
+		GTK4.gdk_toplevel_size_set_size(size,shell.geometry.getRequestedWidth(),shell.geometry.getRequestedHeight() );
+		windowSizeSet = true;
+		shell.geometry.setResize(false);
+	}
+	if(windowSizeSet) return;
+
+	//Only used to set initial size if resize not requested
+	int[] defaultWidth = new int[1];
+	int [] defaultHeight = new int[1];
+	GTK4.gdk_toplevel_size_get_bounds(size, defaultWidth, defaultHeight);
+	defaultWidth[0] = (int) (defaultWidth[0] * Shell.SHELL_TO_MONITOR_RATIO);
+	defaultHeight[0] = (int) (defaultHeight[0] * Shell.SHELL_TO_MONITOR_RATIO);
+	GTK4.gdk_toplevel_size_set_size(size, defaultWidth[0], defaultHeight[0]);
 	windowSizeSet = true;
 	shell.geometry.setResize(false);
-
 }
 
 void activateProc(long action, long parameter, long user_data) {

bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Shell.java

@@ -137,7 +137,7 @@ public class Shell extends Decorations {
 	static final int MAXIMUM_TRIM = 128;
 	static final int BORDER = 3;
 
-	private final double SHELL_TO_MONITOR_RATIO = 0.625; // Fractional: 5 / 8
+	static final double SHELL_TO_MONITOR_RATIO = 0.625; // Fractional: 5 / 8
 
 /**
  * Constructs a new instance of this class. This is equivalent