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@Enuhal I've done that a time or two myself . In addition to Serg's advice there are a couple of things that sometimes save me:That's what "Save Draft" button for. You might continue to write your post after computer restart and even from another computer at a later time. Just log into the forum and you are ready to continue.
I posted a lengthy update, hit the wrong button and - everything gone. So this will be the short version: