Add TextEditor::IsSaved(...)
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This allows software using this widget to track file changes without saving a copy of the entire file. Perplexed uses this to show whether a file has changes that can be saved, while maintaining the ability to undo/redo between saves. This is necessary since `SetText(...)` clears the undo buffer.
This feature should enable more accurate file save indicators, without storing a copy of the entire file
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This PR adds an accurate method of determining whether a file has changes to be saved. Importantly, it does this without discarding undo history, and without using unnecessary memory.