[fltk/fltk] FLTK 1.3.6+ doesn't notify window movement on macOS (Issue #288) - Forums

More fallout from 46235ff. An FLTK application no longer gets calls to Fl_Window::resize() when a window is moved around on macOS.

This bug has been identified on master already and fixed in 3bb3429, so it just needs a back port. Something like:

[ossman@ossman]$ git diff src/Fl_cocoa.mm | cat
diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm
index be07b09fb..ae2958861 100644
--- a/src/Fl_cocoa.mm
+++ b/src/Fl_cocoa.mm
@@ -1438,7 +1440,7 @@ static FLWindowDelegate *flwindowdelegate_instance = nil;
     main_screen_height = CGDisplayBounds(CGMainDisplayID()).size.height;
     int X, Y;
     CocoatoFLTK(window, X, Y);
-    window->Fl_Widget::resize(X, Y, window->w(), window->h());
+    if (window->x() != X || window->y() != Y) window->position(X, Y);
     update_e_xy_and_e_xy_root(nsw);
     // at least since MacOS 10.9: OS moves subwindows contained in a moved window
     // setSubwindowFrame is no longer necessary.

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