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83759c0e94
The key of a raster made for content that shows a symbol includes the
font generation, and since c348b384 (#1723) the key for content
painted with a pattern includes it too. FontDb::add_font increases
that generation, and the six tests in tests_fontchange.rs call it. Two
tests in fx.rs draw such content and count the rasters moved between
frames: moved_rasters_need_the_same_content_and_effects and
a_moved_group_draws_the_shadow_of_the_instance_art_in_it_while_interacting.
Neither held fonts_steady(). When a font test added a font between
their frames, the renderer made the raster again and the test counted
0 rasters moved instead of 1. Under CPU load on Windows, with the font
tests in the same process, the first test failed in 12 of 100 runs and
the second failed in 36 of 70.
Both tests now hold fonts_steady().
translucent_blended_and_shadowed_type_redraws_when_its_font_becomes_available
added its font without the font lock that fonts_steady() holds shared,
and it now takes adding_fonts(), as the other five font tests do. With
the change, the first test passed in all 200 runs and the second
passed in all 120 runs under the same load.