Trying to access source on txLoaded triggers a max call stack exception

[ricardo-a-alves-alb]

Relates to #348

I was trying to access the renderInfo property moreTextLines to check if the text content has overflown. However, the only way I found to access this property is to listen to the txLoaded event of the TextTexture and access the TextureSource.

However, this triggers a max call stack exception because the texture is flagged to be updated on this piece of code:

Lightning/src/tree/Texture.mjs

Lines 120 to 126 in 3d2d7e3

	get source() {
	if (this._mustUpdate || this.stage.hasUpdateSourceTexture(this)) {
	this._performUpdateSource(true);
	this.stage.removeUpdateSourceTexture(this);
	}
	return this._source;
	}

this.stage.hasUpdateSourceTexture(this) always returns true, causing a loop. Is this a bug or I should access renderInfo through some other route?

DEMO

Relevant DEMO code:

this.tag('LongText').on('txLoaded', (texture) => {
    // if we access texture.source, max call stack is triggered
    const label = texture._source.renderInfo.moreTextLines
    this.tag('RemainingLines.Label').text.text = label
})

If the _template already has an initial text defined, it doesn't seem to trigger the exception. However, if we patch a new text after it has been fully initialized, it triggers the exception.