From a81d45df820887cd9c66fb99d921f73632237bfc Mon Sep 17 00:00:00 2001
From: Mounir IDRASSI <mounir.idrassi@idrix.fr>
Date: Sun, 15 Dec 2019 17:59:38 +0100
Subject: MacOSX: Ensure that main window is visible on screen when About is
 display as a way to workaround for situations where UI is not visible or
 can't be move (for example, when changing display monitor with a different
 resolution).

---
 src/Main/Forms/MainFrame.cpp |  1 +
 src/Main/Forms/MainFrame.h   | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/Main/Forms/MainFrame.cpp b/src/Main/Forms/MainFrame.cpp
index 9abe2552..8e0c401b 100644
--- a/src/Main/Forms/MainFrame.cpp
+++ b/src/Main/Forms/MainFrame.cpp
@@ -725,6 +725,7 @@ namespace VeraCrypt
 #ifdef TC_MACOSX
 		if (Gui->IsInBackgroundMode())
 			Gui->SetBackgroundMode (false);
+		EnsureVisible ();
 #endif
 		AboutDialog dialog (this);
 		dialog.ShowModal();
diff --git a/src/Main/Forms/MainFrame.h b/src/Main/Forms/MainFrame.h
index 39c411ad..b8991b73 100644
--- a/src/Main/Forms/MainFrame.h
+++ b/src/Main/Forms/MainFrame.h
@@ -15,6 +15,7 @@
 
 #include "Forms.h"
 #include "ChangePasswordDialog.h"
+#include <wx/display.h>
 
 namespace VeraCrypt
 {
@@ -161,6 +162,26 @@ namespace VeraCrypt
 		void UpdateVolumeList ();
 		void UpdateWipeCacheButton ();
 		void WipeCache ();
+        
+        void EnsureVisible()
+        {
+        	wxDisplay display (this);
+        	wxRect displayRect = display.GetClientArea();
+        	    
+        	bool bMove = false;
+        	wxPoint p = GetScreenPosition();
+        	wxRect r = GetRect ();
+        	if (p.x < displayRect.x)
+        		p.x = 0, bMove = true;
+        	if (p.y < displayRect.y)
+        		p.y = displayRect.y, bMove = true;
+        	if (p.x + r.width > displayRect.x + displayRect.width)
+        		p.x = displayRect.x + displayRect.width - r.width, bMove = true;
+        	if (p.y + r.height > displayRect.y + displayRect.height)
+        		p.y = displayRect.y + displayRect.height - r.height, bMove = true;
+        	if (bMove)
+        		Move (p);
+        }
 
 		struct VolumeActivityMapEntry
 		{
-- 
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