Editor GPU: Avoid invalidating lines and clearing render data when we can avoid it

[Tyriar]

Currently the up to date line cache and render buffer is cleared more aggressively than should be necessary:

vscode/src/vs/editor/browser/gpu/fullFileRenderStrategy.ts

Lines 140 to 177 in 27687b2

	public override onDecorationsChanged(e: ViewDecorationsChangedEvent): boolean {
	// TODO: Don't clear all cells if we can avoid it
	this._invalidateAllLines();
	return true;
	}
	public override onTokensChanged(e: ViewTokensChangedEvent): boolean {
	// TODO: This currently fires for the entire viewport whenever scrolling stops
	// https://github.com/microsoft/vscode/issues/233942
	for (const range of e.ranges) {
	for (let i = range.fromLineNumber; i <= range.toLineNumber; i++) {
	this._upToDateLines[0].delete(i);
	this._upToDateLines[1].delete(i);
	}
	}
	return true;
	}
	public override onLinesDeleted(e: ViewLinesDeletedEvent): boolean {
	// TODO: This currently invalidates everything after the deleted line, it could shift the
	// line data up to retain some up to date lines
	// TODO: This does not invalidate lines that are no longer in the file
	this._invalidateLinesFrom(e.fromLineNumber);
	// Queue updates that need to happen on the active buffer, not just the cache. This is
	// deferred since the active buffer could be locked by the GPU which would block the main
	// thread.
	this._queueBufferUpdate(e);
	return true;
	}
	public override onLinesInserted(e: ViewLinesInsertedEvent): boolean {
	// TODO: This currently invalidates everything after the deleted line, it could shift the
	// line data up to retain some up to date lines
	this._invalidateLinesFrom(e.fromLineNumber);
	return true;
	}