nx::shell reform: Provide an alternative nx::shell impl (nx::shell2), used by all four shell scripts. nx::shell2 builds on Tcl's event loop,…
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nx::shell reform: Provide an alternative nx::shell impl (nx::shell2), used by all four shell scripts. nx::shell2 builds on Tcl's event loop, rather than while + update. This avoids blocking the Tk main window (update). In addition, nx::shell2 is closer to Tcl's native shells (e.g., no extra lines on enter, catches EOF).
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