From 9a11ce772cacea29e31a399059e25f93c14f6dcc Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Fri, 28 Dec 2018 02:07:50 +0100
Subject: compat/check-visible: really fix this time

---
 compat/check-visible.cpp | 47 ++++++++++++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 19 deletions(-)

diff --git a/compat/check-visible.cpp b/compat/check-visible.cpp
index 9afdbb76..4cdb1b46 100644
--- a/compat/check-visible.cpp
+++ b/compat/check-visible.cpp
@@ -3,12 +3,14 @@
 #if defined _WIN32
 
 #include "timer.hpp"
+#include "math.hpp"
 
 #include <QMutex>
+#include <QDebug>
 
 #include <windows.h>
 
-constexpr int visible_timeout = 5000;
+constexpr int visible_timeout = 1000;
 constexpr int invisible_timeout = 250;
 
 static Timer timer;
@@ -23,27 +25,34 @@ void set_is_visible(const QWidget& w, bool force)
         return;
 
     timer.start();
+    HWND hwnd = (HWND)w.winId();
 
-    HWND id = (HWND) w.winId();
-    const QPoint pt = w.mapToGlobal({ 0, 0 });
-    const QPoint pt2 = w.mapToGlobal({ w.width(), w.height() });
-
-    const int W = pt2.x(), H = pt2.y();
-
-    const QPoint points[] =
+    if (RECT r; GetWindowRect(hwnd, &r))
     {
-        pt,
-        pt + QPoint(W - 1, 0),
-        pt + QPoint(0, H - 1),
-        pt + QPoint(W - 1, H - 1),
-        pt + QPoint(W / 2, H / 2),
-    };
-
-    for (const QPoint& pt : points)
+        const int x = r.left+1, y = r.top+1;
+        const int w = r.right - x - 1, h = r.bottom - y - 1;
+
+        const POINT xs[] {
+            { x + w, y },
+            { x, y + h },
+            { x + w, h + y },
+            { x, y },
+            { x + w/2, y + h/2 },
+        };
+
+        visible = false;
+
+        for (const POINT& pt : xs)
+            if (WindowFromPoint(pt) == hwnd)
+            {
+                visible = true;
+                break;
+            }
+    }
+    else
     {
-        visible = WindowFromPoint({ pt.x(), pt.y() }) == id;
-        if (visible)
-            break;
+        eval_once(qDebug() << "check-visible: GetWindowRect failed");
+        visible = true;
     }
 }
 
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