Fix conhost clipboard handling bugs #16618
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conhost has 2 bugs related to clipboard handling: * Missing retry on `OpenClipboard`: When copying to the clipboard explorer.exe is very eager to open the clipboard and peek into it. I'm not sure why it happens, but I can see `CFSDropTarget` in the call stack. It uses COM RPC and so this takes ~20ms every time. That breaks conhost's clipboard randomly during `ConsoleBench`. During non-benchmarks I expect this to break during RDP. * Missing null-terminator check during paste: `CF_UNICODETEXT` is documented to be a null-terminated string, which conhost v2 failed to handle as it relied entirely on `GlobalSize`. Additionally, this changeset simplifies the `HGLOBAL` code slightly by adding `_copyToClipboard` to abstract it away. * `ConsoleBench` (#16453) doesn't fail randomly anymore ✅ (cherry picked from commit 86c30bd)
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DHowett
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Jan 30, 2024
lhecker
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Feb 6, 2024
#16618 contained a bug which was fixed inbox. This ports the changes to the OSS repo manually since the two slightly diverged.
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conhost has 2 bugs related to clipboard handling:
OpenClipboard: When copying to the clipboardexplorer.exe is very eager to open the clipboard and peek into it.
I'm not sure why it happens, but I can see
CFSDropTargetin thecall stack. It uses COM RPC and so this takes ~20ms every time.
That breaks conhost's clipboard randomly during
ConsoleBench.During non-benchmarks I expect this to break during RDP.
CF_UNICODETEXTisdocumented to be a null-terminated string, which conhost v2
failed to handle as it relied entirely on
GlobalSize.Additionally, this changeset simplifies the
HGLOBALcode slightlyby adding
_copyToClipboardto abstract it away.ConsoleBench(Add an automated conhost benchmark tool #16453) doesn't fail randomly anymore ✅(cherry picked from commit 86c30bd)