[Pidgin] #15750: IRC ACTIONs skip sending-im-msg signal.

[Pidgin]

#15750: IRC ACTIONs skip sending-im-msg signal.
--------------------+-------------------------
 Reporter:  xnyhps  |      Owner:  elb
     Type:  patch   |     Status:  new
Milestone:          |  Component:  IRC
  Version:  2.10.7  |   Keywords:  irc otr /me
--------------------+-------------------------
 For most protocols {{{/me}}} gets sent raw, but is displayed differently.
 For IRC, it is also sent differently. Because {{{/me}}} is interpreted as
 a command, it bypasses all normal message logic, including the "sending-
 im-msg" signal. This implies that, for instance, OTR does not get a chance
 to encrypt the message and it is sent in plain.

 Because this is undesirable when using OTR, the "sending-im-msg" signal
 should fire. Attached patch implements this.

 Note that it encrypts "\001ACTION " part too, to be compatible with other
 IRC clients with OTR support. I'm not sure this is desirable for all
 plugins that look for the "sending-im-msg" signal.

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Ticket URL: <https://developer.pidgin.im/ticket/15750>
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