Sam Atkins 1d7d194062 LibGUI: Use set_text() for ReplaceAllTextCommand ...

Previously, this was reimplementing the same thing by removing all the
document text and then inserting the new text - which internally would
insert each code-point individually and fire change notifications for
each one. This made the "Reformat GML" button very slow, since it not
only had to recalculate the visual lines of the document each time, but
also rebuild the preview GUI.

The reason not to use `set_text()` is that it would throw away the undo
stack, since it always behaved as if the text is a new document. So,
let's add a parameter to disable that behaviour.

This takes the time for reformatting a ~200 line GML file from several
seconds, to basically instantaneous. :^)

2023-07-26 14:18:20 -04:00

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