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debug corefile dialog now has remote file chosen and remote file validation, for validation, because each key stroke will trigger validation on remote host, user can not get immediate response of key stroke, we may want to reconsider if we want to do this remote file validation or do some optimizatio here.
DLight used to have a similar issue. Andrew may be able to share his experience in fixing it.
My personal NetBeans user experience says (or, better, cries) that file verification on each keystroke isn't right thing to do even without remote. Many times I was irritated with very slow NetBeans response, and then thread dump showed me that slow disk operations are made in UI thread. So user may run into the same trouble with just slow file system (e.g. /net/...). So I believe such problems should be solved on client side - via scheduling a delayed task in a separate thread and disabling OK button (or other controls) until input is verified.
Do we need to notify user that validation is in progress?
Ideally, we should. Usually we have a place where error message is displayed in the case data is not valid - we can show "Validating..." message in it. That's how it is done when adding a new remote tool chain.