fix problems with context being set after a backing resize
fix problems with context being set after a backing resize

mpw/marcelweiher-libobjc2,liruqi/cocotron,berkus/cocotron,liruqi/cocotron,mpw/marcelweiher-libobjc2,uptime-services/development-arts,uptime-services/development-arts,mpw/marcelweiher-libobjc2,berkus/cocotron,liruqi/cocotron,berkus/cocotron,mpw/marcelweiher-libobjc2,uptime-services/development-arts,berkus/cocotron,uptime-services/development-arts,liruqi/cocotron