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Kleopatra: Use event counter CARD of gpg-agent
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Description

Currently, each time a smart card view window is opened, scdaemon read actions are triggered.

This is inefficient, the event counter of gpg-agent should be used, if the counter has not changed, the card does not have to be read again.

GETEVENTCOUNTER
Return a status line named EVENTCOUNTER with the current values
of all event counters.  The values are decimal numbers in the range
0 to UINT_MAX and wrapping around to 0.  The actual values should
not be relied upon, they shall only be used to detect a change.

The currently defined counters are:

ANY  - Incremented with any change of any of the other counters.
KEY  - Incremented for added or removed private keys.
CARD - Incremented for changes of the card readers stati.

Event Timeline

FWIW, there is some code in gpa which uses the event counter. It was introduced with
rGPA936825b4b994cdf5900fc987abd9be7889989627

werner triaged this task as Normal priority.Thu, Nov 14, 3:14 PM