Fix conhost clipboard handling bugs #16457
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lhecker
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@DHowett This is another PR we could merge into 1.19 inbox if we wanted to. It does fix actual bugs, but they have been in conhost since forever and so I'm not sure how important fixing it ASAP is. |
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@lhecker merge conflict from Tushar's work |
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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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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.Validation Steps Performed
ConsoleBench(Add an automated conhost benchmark tool #16453) doesn't fail randomly anymore ✅