Revert "use same background for dialog"

This reverts commit c07ba3825243d00239102e68dc19af3a498297dc.
javadocs
intentions category font fixed (IDEA-133995)
structural search and replace: do not validate under write action; commit all documents before dialog is shown
Merge remote-tracking branch 'origin/master'
javadoc
use JBUI.Fonts
Merge remote-tracking branch 'origin/master'
rewrite getFontSize() method to support HiDPI
nullity inference: unknown wins over a single delegat
infer contracts from comparisons with non-null value
nullity inference: a more self-explanatory "test delegation to nullable means nothing"
update javadoc for com.intellij.codeInsight.InferredAnnotationsManager.ignoreInference