Avoid over-releasing the displayport in cmsYieldDisplay() #3351
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Since cmsScanKeys() can generate multiple key presses when repeating the same key, cmsYieldDisplay() was releasing the displayport even if it wasn't grabbed and causing the grab/release calls to become unbalanced.
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Since cmsScanKeys() can generate multiple key presses when repeating
the same key, cmsYieldDisplay() was releasing the displayport even
if it wasn't grabbed and causing the grab/release calls to become
unbalanced.