Move glfwGetMonitorWorkarea test to monitors

This moves the test use of glfwGetMonitorWorkarea from the simple
example to the monitors test program.

Related to #1322.

examples/simple.c

@@ -79,7 +79,6 @@ int main(void)
     GLFWwindow* window;
     GLuint vertex_buffer, vertex_shader, fragment_shader, program;
     GLint mvp_location, vpos_location, vcol_location;
-    int workarea_x, workarea_y, workarea_width, workarea_height;
 
     glfwSetErrorCallback(error_callback);
 
@@ -132,8 +131,6 @@ int main(void)
     glVertexAttribPointer(vcol_location, 3, GL_FLOAT, GL_FALSE,
                           sizeof(vertices[0]), (void*) (sizeof(float) * 2));
 
-    glfwGetMonitorWorkarea(glfwGetPrimaryMonitor(), &workarea_x, &workarea_y, &workarea_width, &workarea_height);
-    printf("Monitor work area: %d, %d, %d, %d\n", workarea_x, workarea_y, workarea_width, workarea_height);
     while (!glfwWindowShouldClose(window))
     {
         float ratio;

tests/monitors.c

@@ -93,13 +93,16 @@ static void key_callback(GLFWwindow* window, int key, int scancode, int action,
 static void list_modes(GLFWmonitor* monitor)
 {
     int count, x, y, width_mm, height_mm, i;
+    int workarea_x, workarea_y, workarea_width, workarea_height;
     float xscale, yscale;
+
     const GLFWvidmode* mode = glfwGetVideoMode(monitor);
     const GLFWvidmode* modes = glfwGetVideoModes(monitor, &count);
 
     glfwGetMonitorPos(monitor, &x, &y);
     glfwGetMonitorPhysicalSize(monitor, &width_mm, &height_mm);
     glfwGetMonitorContentScale(monitor, &xscale, &yscale);
+    glfwGetMonitorWorkarea(monitor, &workarea_x, &workarea_y, &workarea_width, &workarea_height);
 
     printf("Name: %s (%s)\n",
            glfwGetMonitorName(monitor),
@@ -110,6 +113,8 @@ static void list_modes(GLFWmonitor* monitor)
 
     printf("Physical size: %i x %i mm (%0.2f dpi)\n",
            width_mm, height_mm, mode->width * 25.4f / width_mm);
+    printf("Monitor work area: pos=(%d,%d)  size=(%dx%d)\n",
+            workarea_x, workarea_y, workarea_width, workarea_height);
 
     printf("Modes:\n");