Jonas Jenwald d7d1f23826 Zero the width/height of the temporary canvas used during TextLayer rendering
The default size of these canvases seem to be `300 x 150` (two orders of magnitude larger than the ones in PR 10597), which probably is sufficient enough to matter since there's one such canvas for each textLayer that's rendered in the viewer.

Also fixes the incorrect rejection reason, i.e. one using a string rather than an `Error`, in the `TextLayerRenderTask.cancel` method.
2019-03-01 04:05:37 +01:00
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