Fix debugging script blocks that aren't in files #2064
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The code relied on running `list 1 <MaxInt>` but that wasn't being run in the debug context because we allow-list commands to prevent pollution of the history, and missed it. Like the `prompt` and interactive commands (which `list` could be but is not when we run it) we need to check for this exact `list` command and run it under the debugger. Moreover, we also weren't locking the `debugInfoHandle`, nor were we correctly checking if `scriptListingLines` was empty (it was never null), and our shortcut to skip allocation was broken. Actually we can't skip allocation, but we can at least skip superfluous conversions.
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The code relied on running
list 1 <MaxInt>but that wasn't being run in the debug context because we allow-list commands to prevent pollution of the history, and missed it. Like thepromptand interactive commands (whichlistcould be but is not when we run it) we need to check for this exactlistcommand and run it under the debugger.Moreover, we also weren't locking the
debugInfoHandle, nor were we correctly checking ifscriptListingLineswas empty (it was never null), and our shortcut to skip allocation was broken. Actually we can't skip allocation, but we can at least skip superfluous conversions.Resolves PowerShell/vscode-powershell#3904.