Add option to apply python-mode fontification to input echoed to shell #1711
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Alternative solution to PR #1698 and #1428.
PR #1698 first inserts the echoed input into the shell buffer and then fontifies it. This causes problems (1) when a continuation prompt is used and (2) when the input is truncated because it is long. In both cases, fontification may be confused.
This PR proceeds the other way around: it first fontifies the echoed input and then inserts it into the shell buffer (potentially with continuation prompt). This leads to correct formatting (for all valid Python code).