ofAppGLFWWindow - Incorrect value for pixelScreenCoordScale when minimizing window

When ofAppGLFWWindow is minimized, a call to ofAppGLFWWindow::resize_cb() is made while window and framebuffer width/height are 0.

Therefore, the code updates pixelScreenCoordScale with an invalid value (division by 0) :

void ofAppGLFWWindow::resize_cb(GLFWwindow* windowP_, int w, int h) {
	ofAppGLFWWindow * instance = setCurrent(windowP_);

	// Detect if the window is running in a retina mode

	int framebufferW, framebufferH; // <- physical pixel extents
	glfwGetFramebufferSize(windowP_, &framebufferW, &framebufferH);

	int windowW, windowH; // <- screen coordinates, which may be scaled
	glfwGetWindowSize(windowP_, &windowW, &windowH);

	// Find scale factor needed to transform from screen coordinates
	// to physical pixel coordinates
	instance->pixelScreenCoordScale = (float)framebufferW / (float)windowW;  // <----- Division by zero

Calls to ofGetWidth() and ofGetHeight() in ofApp::Draw()/ofApp::Update() then returns invalid values since they scale according to pixelScreenCoordScale .

Start at ofAppGLFWWindow::resize_cb() and trace how the window and framebuffer dimensions update pixelScreenCoordScale during minimization. Reproduce the minimized-window path, then verify that ofGetWidth() and ofGetHeight() remain valid when the dimensions are zero; the payload does not name a test file.