Update reopen mailbox after device goes to sleep

reopen-mailbox-after-device-goes-to-sleep.md

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 This test addresses a comment 
 
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 "I think we already do this, but it needs testing. When opening the mailbox after the device went to sleep, we should show a dialog asking for battery optimization exception again." in the ticket 
 
 https://code.briarproject.org/briar/briar-mailbox/-/issues/120#note_68771 
 
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+ and ticket https://code.briarproject.org/briar/briar-mailbox/-/issues/145
+ and ticket https://code.briarproject.org/briar/briar-mailbox/-/issues/120
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+In the ticket 120, there is a comment that says 
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+"When opening the mailbox after the device went to sleep, we should show a dialog asking for battery optimization exception again."
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+The sleep this comment is talking about is not simply the sleep when device is inactive for a few mins and the screen goes black.  Instead, it is a kind of sleep that Android invokes if it sees that an app uses too much memory, or battery etc, based on its own logic.  
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+To put a device into this Android invoked 'doze', issue this command
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+adb shell dumpsys deviceidle force-idle
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+(just in case I forget after awhile - adb commands need to be issued from the adb folder, which are in different locations on mac and windowds machines)
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+adb shell dumpsys deviceidle unforce
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+if permission is denied, it could be because the USB debugging is off for the device
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+To see if connection to device is OK, type in > ./adb devices (on mac) and .(backward slash)adb devices on windows?
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 Steps to execute
 
 - install and start th emailbox in the normal way and then allow the mailbox device to go to sleep