IModel.onDidChangeContent doesn't provide information about what was there before the change

[ljw1004]

Scenario:

1. I have a content widget at line 9 in the file.
2. The user types in a newline at line 3.
3. I want to bump my content widget down one line, so it's still anchored to the same line in the file.

I've hooked into IModel.onDidChangeContent. That provides me IModelContentChangedEvent2 which has the original span, and the new text that has replaced what was there before. But that alone isn't enough for me to calculate the net change in number of lines caused by this event (hence, the number of lines that my existing content widgets must scroll by).

[ljw1004]

Doh. Actually, I think it does provide enough information. I can look at range.endLineNumber - range.startLineNumber to count how many lines the original span encompassed, and I can use getPositionAtOffset to count how many lines the replacement text encompassed, and that's enough.

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