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Abort symbol rendering early if render job is cancelled
Some symbol rendering operations take a long time, especially if settings are accidentally ridiculous (e.g. changing a marker line with interval 1 mm to map units on a small scale map can result in millions+ of markers being rendered for a single feature). If we don't abort these operations responsively, then the render job can become effectively "stuck" and sit burning away CPU for no good reason (or in some cases lock the QGIS ui as a result). Instead, for possibly length symbol rendering operations we check at reasonable places for the QgsRenderContext::renderingStopped() flag and if it's set, abort the rendering quickly and gracefully. (cherry picked from commit bb0d449)
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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