`EditContext.text` should not extend by default

[mozesstumpf]

As far as I know, the EditContext.text is mainly designed for text editors that use the canvas element or choose the "hidden text area" solution. This may be a good fit for them, but that's not always the case.

There are text editors that rely on solutions like Virtual DOM or Custom Elements, and in that case, the text property is unused.

With the current implementation, the text property expands itself, assuming that we would use it. However, when we are not using it, we have to clear it to avoid using extra memory.

editContext.addEventListener("textupdate", () => {
    // Clear the text to avoid unnecessary memory usage
    editContext.updateText(0, editContext.text.length, "");
});

My suggestion is to change the behavior of the text somehow to not expand by default.

[marijnh]

I assume that this text is going to be used by the IME system (to provide context-aware virtual keyboard behavior, for example), and that keeping it empty is a bad idea. But it would be useful to get some more specifics on how much context should be kept in it and what the cost model of keeping a large document in the context is.