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[sdl2-branch] toggle fullscreen with cmd+enter

This morning's breakfast coding...

Special-case listen for LGUI/RGUI + enter (which is Command on Mac;
Windows key on Windows; Meta or whatever on Linux) and toggle
fullscreen.

On Mac, when you are fullscreen-via-maximize-button, if you push the mouse
pointer to the top edge, the titlebar scrolls down and you could click to
de-maximize. This does not happen if you are fullscreen-via-shortcut. I
think this might be an SDL2 bug or quirk.

--- a/src/i_video.c

+++ b/src/i_video.c

@@ -318,6 +318,12 @@

     }

 }

+static void I_ToggleFullScreen(void)

+{

+    Uint32 flags = SDL_GetWindowFlags(screen) & SDL_WINDOW_FULLSCREEN_DESKTOP;

+    SDL_SetWindowFullscreen(screen, flags ^ SDL_WINDOW_FULLSCREEN_DESKTOP);

+}

+

 void I_GetEvent(void)

 {

     extern void I_HandleKeyboardEvent(SDL_Event *sdlevent);

@@ -331,6 +337,14 @@

         switch (sdlevent.type)

         {

             case SDL_KEYDOWN:

+                if (sdlevent.key.keysym.scancode == SDL_SCANCODE_RETURN &&

+                    sdlevent.key.keysym.mod & (KMOD_LGUI | KMOD_RGUI))

+                {

+                    I_ToggleFullScreen();

+                    break;

+                }

+                // deliberate fall-though

+

             case SDL_KEYUP:

 		I_HandleKeyboardEvent(&sdlevent);

                 break;