5 files changed, 24 insertions, 13 deletions
diff --git a/src/Fl_Window.cxx b/src/Fl_Window.cxx
index 6ded79b01..c0dad7e37 100644
--- a/src/Fl_Window.cxx
+++ b/src/Fl_Window.cxx
@@ -954,13 +954,14 @@ fl_uintptr_t Fl_Window::os_id() { return pWindowDriver->os_id();}
 
  This function is effective only with a show()'n, resizable, top-level window.
  Bordered and borderless windows can be used.
+ Fullscreen windows can't be used.
  \see Fl_Window::un_maximize(), Fl_Window::maximize_active()
  */
 void Fl_Window::maximize() {
-  if (!shown() || parent() || !is_resizable() || maximize_active()) return;
+  if (!shown() || parent() || !is_resizable() || maximize_active() || fullscreen_active())
+    return;
   set_flag(MAXIMIZED);
-  if (border()) pWindowDriver->maximize();
-  else pWindowDriver->Fl_Window_Driver::maximize();
+  pWindowDriver->maximize();
 }
 
 /**
@@ -968,10 +969,9 @@ void Fl_Window::maximize() {
  \see Fl_Window::maximize()
 */
 void Fl_Window::un_maximize() {
-  if (!shown() || parent() || !is_resizable() || !maximize_active()) return;
+  if (!shown() || parent() || !is_resizable() || !maximize_active() || fullscreen_active()) return;
   clear_flag(MAXIMIZED);
-  if (border()) pWindowDriver->un_maximize();
-  else pWindowDriver->Fl_Window_Driver::un_maximize();
+  pWindowDriver->un_maximize();
 }
 
 void Fl_Window::is_maximized_(bool b) {
diff --git a/src/Fl_Window_fullscreen.cxx b/src/Fl_Window_fullscreen.cxx
index f6919f87c..e464a9fba 100644
--- a/src/Fl_Window_fullscreen.cxx
+++ b/src/Fl_Window_fullscreen.cxx
@@ -37,10 +37,12 @@ void Fl_Window::border(int b) {
 */
 void Fl_Window::fullscreen() {
   if (!is_resizable()) return;
-  no_fullscreen_x = x();
-  no_fullscreen_y = y();
-  no_fullscreen_w = w();
-  no_fullscreen_h = h();
+  if (!maximize_active()) {
+    no_fullscreen_x = x();
+    no_fullscreen_y = y();
+    no_fullscreen_w = w();
+    no_fullscreen_h = h();
+  }
   if (shown() && !(flags() & Fl_Widget::FULLSCREEN)) {
     pWindowDriver->fullscreen_on();
   } else {
@@ -54,7 +56,8 @@ void Fl_Window::fullscreen_off(int X,int Y,int W,int H) {
   } else {
     clear_flag(FULLSCREEN);
   }
-  no_fullscreen_x = no_fullscreen_y = no_fullscreen_w = no_fullscreen_h = 0;
+  if (!maximize_active())
+    no_fullscreen_x = no_fullscreen_y = no_fullscreen_w = no_fullscreen_h = 0;
 }
 
 void Fl_Window::fullscreen_off() {
diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm
index e7e3c8a50..285b3d469 100644
--- a/src/Fl_cocoa.mm
+++ b/src/Fl_cocoa.mm
@@ -3328,12 +3328,14 @@ void Fl_Cocoa_Window_Driver::fullscreen_on() {
 
 
 void Fl_Cocoa_Window_Driver::maximize() {
-  [fl_xid(pWindow) performZoom:nil];
+  if (border()) [fl_xid(pWindow) performZoom:nil];
+  else Fl_Window_Driver::maximize();
 }
 
 
 void Fl_Cocoa_Window_Driver::un_maximize() {
-  [fl_xid(pWindow) performZoom:nil];
+  if (border()) [fl_xid(pWindow) performZoom:nil];
+  else Fl_Window_Driver::un_maximize();
 }
 
 
@@ -3387,6 +3389,7 @@ void Fl_Cocoa_Window_Driver::fullscreen_off(int X, int Y, int W, int H) {
     [nswin setStyleMask:calc_win_style(pWindow)]; //10.6
     restore_window_title_and_icon(pWindow, icon_image);
     pWindow->resize(X, Y, W, H);
+    if (pWindow->maximize_active()) Fl_Window_Driver::maximize();
     if (has_focus) [nswin makeKeyAndOrderFront:nil];
     else [nswin orderFront:nil];
   } else
diff --git a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
index 46df38e6b..79d26a03b 100644
--- a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
+++ b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
@@ -2175,10 +2175,12 @@ Fl_Wayland_Plugin *Fl_Wayland_Window_Driver::gl_plugin() {
 void Fl_Wayland_Window_Driver::maximize() {
   struct wld_window *xid = (struct wld_window *)Fl_X::flx(pWindow)->xid;
   if (xid->kind == DECORATED) libdecor_frame_set_maximized(xid->frame);
+  else Fl_Window_Driver::maximize();
 }
 
 
 void Fl_Wayland_Window_Driver::un_maximize() {
   struct wld_window *xid = (struct wld_window *)Fl_X::flx(pWindow)->xid;
   if (xid->kind == DECORATED) libdecor_frame_unset_maximized(xid->frame);
+  else Fl_Window_Driver::un_maximize();
 }
diff --git a/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx b/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx
index f6ad0bcad..b930719a6 100644
--- a/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx
+++ b/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx
@@ -610,6 +610,7 @@ void Fl_WinAPI_Window_Driver::fullscreen_off(int X, int Y, int W, int H) {
   scaledW += bx*2;
   scaledH += by*2+bt;
   SetWindowLong(fl_xid(pWindow), GWL_STYLE, style);
+  if (pWindow->maximize_active()) return this->maximize();
   SetWindowPos(fl_xid(pWindow), 0, scaledX, scaledY, scaledW, scaledH,
                SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED);
   Fl::handle(FL_FULLSCREEN, pWindow);
@@ -617,10 +618,12 @@ void Fl_WinAPI_Window_Driver::fullscreen_off(int X, int Y, int W, int H) {
 
 
 void Fl_WinAPI_Window_Driver::maximize() {
+  if (!border()) return Fl_Window_Driver::maximize();
   ShowWindow(fl_xid(pWindow), SW_SHOWMAXIMIZED);
 }
 
 void Fl_WinAPI_Window_Driver::un_maximize() {
+  if (!border()) return Fl_Window_Driver::un_maximize();
   ShowWindow(fl_xid(pWindow), SW_SHOWNORMAL);
 }