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Created attachment 8276 [details]
TestToolStripShortcuts.zip contains a small program that demonstrates the bug.
ToolStrip.ProcessMnemonic for some reason tries to accept the leading character of a ToolStripItem.Text as a shortcut key ("mnemonic"), not just characters explicitly marked as shortcut keys by an & in the text string. This does not happen on Windows using .Net, and it can prevent valid shortcut keys from being processed correctly. I'm attaching a simple example program to illustrate the problem.
The same code exists in version 3.6, but this was discovered using version 3.4.
I've submitted a pull request that fixes this bug: https://github.com/mono/mono/pull/1322.