Added proper monitor comparison.

src/cocoa_monitor.m

@@ -305,6 +305,11 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* count)
     return monitors;
 }
 
+GLboolean _glfwPlatformIsSameMonitor(_GLFWmonitor* first, _GLFWmonitor* second)
+{
+    return first->ns.displayID == second->ns.displayID;
+}
+
 void _glfwPlatformGetMonitorPos(_GLFWmonitor* monitor, int* xpos, int* ypos)
 {
     const CGRect bounds = CGDisplayBounds(monitor->ns.displayID);

src/internal.h

@@ -363,6 +363,16 @@ void _glfwPlatformSetCursorMode(_GLFWwindow* window, int mode);
  */
 _GLFWmonitor** _glfwPlatformGetMonitors(int* count);
 
+/*! @brief Checks whether two monitor objects represent the same monitor.
+ *
+ *  @param[in] first The first monitor.
+ *  @param[in] second The second monitor.
+ *  @return @c GL_TRUE if the monitor objects represent the same monitor, or @c
+ *  GL_FALSE otherwise.
+ *  @ingroup platform
+ */
+GLboolean _glfwPlatformIsSameMonitor(_GLFWmonitor* first, _GLFWmonitor* second);
+
 /*! @copydoc glfwGetMonitorPos
  *  @ingroup platform
  */

src/monitor.c

@@ -106,7 +106,7 @@ void _glfwInputMonitorChange(void)
             if (_glfw.monitors[j] == NULL)
                 continue;
 
-            if (strcmp(monitors[i]->name, _glfw.monitors[j]->name) == 0)
+            if (_glfwPlatformIsSameMonitor(monitors[i], _glfw.monitors[j]))
             {
                 // This monitor was connected before, so re-use the existing
                 // monitor object to preserve its address and user pointer

src/win32_monitor.c

@@ -174,6 +174,11 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* count)
     return monitors;
 }
 
+GLboolean _glfwPlatformIsSameMonitor(_GLFWmonitor* first, _GLFWmonitor* second)
+{
+    return wcscmp(first->win32.name, second->win32.name);
+}
+
 void _glfwPlatformGetMonitorPos(_GLFWmonitor* monitor, int* xpos, int* ypos)
 {
     DEVMODE settings;

src/x11_monitor.c

@@ -224,6 +224,11 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* found)
     return monitors;
 }
 
+GLboolean _glfwPlatformIsSameMonitor(_GLFWmonitor* first, _GLFWmonitor* second)
+{
+    return first->x11.crtc == second->x11.crtc;
+}
+
 void _glfwPlatformGetMonitorPos(_GLFWmonitor* monitor, int* xpos, int* ypos)
 {
     if (_glfw.x11.randr.available)