in src/com/jetbrains/php/tools/quality/phpstan/PhpStanComposerConfig.java [123:134]
protected boolean applyRulesetFromRoot(@NotNull Project project) {
VirtualFile customRulesetFile = detectCustomRulesetFile(project.getBaseDir(), PHPSTAN_NEON);
if(customRulesetFile == null){
customRulesetFile = detectCustomRulesetFile(project.getBaseDir(), PHPSTAN_NEON + ".dist");
}
if (customRulesetFile != null) {
final String path = customRulesetFile.getPath();
return modifyRulesetPhpStanInspectionSetting(project, tool -> applyRuleset(PhpStanOptionsConfiguration.getInstance(project), path));
}
return false;
}