Fix "Wayland: crash with set_menu_window()" (#892)

Fixes also a similar crash occuring after use of set_tooltip_window().
Two bool member variables are added to class Fl_Window_Driver
to indicate true FLTK menu windows (i.e., created by Fl_Menu_Item::pulldown())
and true FLTK tooltip windows (i.e., Fl_Tooltip).

5 files changed, 12 insertions, 4 deletions

diff --git a/src/Fl_Menu.cxx b/src/Fl_Menu.cxx
index 3a3e70708..115e69fe7 100644
--- a/src/Fl_Menu.cxx
+++ b/src/Fl_Menu.cxx
@@ -115,6 +115,7 @@ protected:
     Fl_Menu_Window(X, Y, W, H, 0) {
       menu = m;
       set_menu_window();
+      Fl_Window_Driver::driver(this)->fltk_menu_window = true;
       end();
       set_modal();
       clear_border();
@@ -183,13 +184,13 @@ Fl_Window *Fl_Window_Driver::menu_parent(int *display_height) {
 }
 
 static menuwindow *to_menuwindow(Fl_Window *win) {
-  if (!win->menu_window()) return NULL;
+  if (!Fl_Window_Driver::driver(win)->fltk_menu_window) return false;
   return ((window_with_items*)win)->as_menuwindow();
 }
 
 /** Returns whether win is a menutitle window */
 bool Fl_Window_Driver::is_menutitle(Fl_Window *win) {
-  if (!win->menu_window()) return false;
+  if (!Fl_Window_Driver::driver(win)->fltk_menu_window) return false;
   return (((window_with_items*)win)->as_menuwindow() == NULL);
 }
 
@@ -233,7 +234,7 @@ int *Fl_Window_Driver::menu_offset_y(Fl_Window *win) {
 
 /** Returns whether win is a non-menubar menutitle */
 bool Fl_Window_Driver::is_floating_title(Fl_Window *win) {
-  if (!win->menu_window()) return false;
+  if (!Fl_Window_Driver::driver(win)->fltk_menu_window) return false;
   Fl_Window *mwin = ((window_with_items*)win)->as_menuwindow();
   return !mwin && !((menutitle*)win)->in_menubar;
 }
diff --git a/src/Fl_Tooltip.cxx b/src/Fl_Tooltip.cxx
index f77b668e9..1be2078bf 100644
--- a/src/Fl_Tooltip.cxx
+++ b/src/Fl_Tooltip.cxx
@@ -20,6 +20,7 @@
 #include <FL/Fl.H>
 #include <FL/fl_string_functions.h>
 #include "Fl_System_Driver.H"
+#include "Fl_Window_Driver.H"
 
 #include <stdio.h>
 
@@ -50,6 +51,7 @@ public:
   Fl_TooltipBox() : Fl_Menu_Window(0, 0) {
     set_override();
     set_tooltip_window();
+    Fl_Window_Driver::driver(this)->fltk_tooltip_window = true;
     end();
   }
   void draw() FL_OVERRIDE;
diff --git a/src/Fl_Window_Driver.H b/src/Fl_Window_Driver.H
index 43eee2227..5892a3a31 100644
--- a/src/Fl_Window_Driver.H
+++ b/src/Fl_Window_Driver.H
@@ -65,6 +65,8 @@ public:
   static fl_uintptr_t xid(const Fl_Window *win);
   static Fl_Window *find(fl_uintptr_t xid);
   int wait_for_expose_value;
+  bool fltk_menu_window; // true for FLTK menu window
+  bool fltk_tooltip_window; // true for FLTK tooltip window
   Fl_Image_Surface *other_xid; // offscreen bitmap (overlay and double-buffered windows)
   int screen_num();
   void screen_num(int n) { screen_num_ = n; }
diff --git a/src/Fl_Window_Driver.cxx b/src/Fl_Window_Driver.cxx
index c09581625..d4ca4647d 100644
--- a/src/Fl_Window_Driver.cxx
+++ b/src/Fl_Window_Driver.cxx
@@ -43,6 +43,8 @@ Fl_Window_Driver::Fl_Window_Driver(Fl_Window *win)
   wait_for_expose_value = 0;
   other_xid = 0;
   screen_num_ = 0;
+  fltk_menu_window = false;
+  fltk_tooltip_window = false;
 }
 
 
diff --git a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
index 9b04779cb..7bdf30f2b 100644
--- a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
+++ b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
@@ -1394,12 +1394,13 @@ void Fl_Wayland_Window_Driver::makeWindow()
   // put transient scale win at center of top window by making it a tooltip of top
     Fl_Screen_Driver::transient_scale_parent = Fl::first_window();
     pWindow->set_tooltip_window();
+    fltk_tooltip_window = true;
     pWindow->position(
               (Fl_Screen_Driver::transient_scale_parent->w() - pWindow->w())/2 ,
               (Fl_Screen_Driver::transient_scale_parent->h() - pWindow->h())/2);
   }
 
-  if (pWindow->menu_window() || pWindow->tooltip_window()) { // a menu window or tooltip
+  if (fltk_menu_window || fltk_tooltip_window) { // a menu window or tooltip
     is_floatingtitle = process_menu_or_tooltip(new_window);
 
   } else if (pWindow->border() && !pWindow->parent() ) { // a decorated window