This procedure is typically invoked when a Tcl error occurs during
background processing such as executing an event handler.
When such an error occurs, the error condition is reported to Tcl
or to a widget or some other C code, and there is not usually any
obvious way for that code to report the error to the user.
In these cases the code calls
It is possible for many background errors to accumulate before bgerror is invoked. When this happens, each of the errors is processed in order. However, if bgerror returns a break exception, then all remaining error reports for the interpreter are skipped.
Windows Server 2012. Windows 8.1. Windows Server 2012 R2. Windows 10. Windows Server 2016. Windows Server 2019.
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