Android screen rotation issue: testdrawchessboard.c sample + alternate software renderer creation method

Hi all,

If I build the testdrawchessboard.c sample (the software renderer demo) for
Android and run it on a device, I can rotate the device to change
orientation and the chessboard follows as expected. However, if I change
the method of creating the software renderer (around line 110) from:

    surface = SDL_GetWindowSurface(window);
    renderer = SDL_CreateSoftwareRenderer(surface);

to

    renderer = SDL_CreateRenderer( window, -1, SDL_RENDERER_SOFTWARE |
SDL_RENDERER_TARGETTEXTURE );

then when I launch the app, rotating the device to change orientation
results in the screen going black until I restart the app.

Is my alternative method of creating a software renderer invalid, or is
this a bug in SDL2?

Tested with Mercurial tip code (as of last night) using an HTC One M8 and
Samsung Galaxy Note 4.

Thanks in advance,
Michael

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