How to make Wireshark GUI reload ikev2_decryption_table without restarting?

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Ctrl+Shift+L (or Analyze > Reload Lua Plugins)

This makes wireshark reload the file <user>/.config/wireshark/ikev2_decryption_table, like it usually does at startup.

This may be useful if you edited such file by yourself, for ex. by a script that automatically reads all parameters from your ipsec log (SPI's, SK's, encryption and integrity algorithms) and formats them into a proper wireshark/ikev2_decryption_table entry.

But the usual way is to add all parameters from GUI: Edit > Preferences > Protocols > ISAKMP > IKEv2 Decryption Table Edit