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After having assigned the usage message to f using 

ClearAll@f; f::usage=ToString@RandomInteger@{10^10,10^11};

the mouseover message is stuck at the first assignment while ?f shows the freshest usage message.

How to clear and reassign the usage message so even mouseover is updated?

Env:
Mathematica 12.0 on Win10

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    $\begingroup$ You have use Remove to get rid of usage messages. $\endgroup$ Commented Jan 24, 2020 at 23:43
  • $\begingroup$ @m_goldberg works! I'll accept if you answer... why doesn't ClearAll work though? $\endgroup$ Commented Jan 25, 2020 at 3:17

1 Answer 1

Reset to default
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It seems one can use the following to force the front-end to update the usage templates (starting in version 12.0):

FE`CacheTemplateAndUsage["f"]

Please note that the front-end will not update the templates even if you set a new usage message. Simply call the above again to force the update once again.

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  • $\begingroup$ I think the packet this calls has existed since 11 $\endgroup$ Commented Jan 29, 2020 at 23:16
  • $\begingroup$ @b3m2a1 For me, it doesn't seem to work: I get "Could not process unknown packet "CacheTemplateAndUsagePacket"" if I try it in 11.3. Am I missing something? $\endgroup$ Commented Jan 30, 2020 at 8:40
  • $\begingroup$ not really sure but I think it it did work $\endgroup$ Commented Jan 30, 2020 at 8:42

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