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vbox6: clear screen on guest triggered blanking
An invalid bitmap is exactly once set during blanking, use this as hint to clear the GUI content. Same as done in vbox5. Fixes #5263
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@ -214,6 +214,7 @@ class Genodefb :
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Lock();
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if (_display_bitmap.isNull()) {
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_clear_screen();
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Unlock();
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return S_OK;
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}
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