Jonas Jenwald 1ae9ba1d64 Don't clear the canvas until re-rendering is finished when the scale or rotation is changed (issue 6467)
*This regressed in PR 4920.*

The main motivation for PR 4920 was to quickly get rid of old canvases when pages are evicted from the `PDFPageViewBuffer` cache. However it inadvertently broke the use-case where the `canvas` is used as a preview, on scale or rotation changes, until the re-rendering is finished.

Fixes 6467.
2015-09-26 15:40:59 +02:00
..
2015-02-17 11:07:37 -05:00
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