Implemented Double-Checked Locking in ImagehandleManager#2905

HeikoKlare merged 1 commit intoeclipse-platform:mastereclipse-platform/eclipse.platform.swt:masterfrom

vi-eclipse:amartya4256/image_concurrency_fixvi-eclipse/eclipse.platform.swt:amartya4256/image_concurrency_fixCopy head branch name to clipboard