Make XML tab better
Some useful features would be, in decreasing order of importance:
- clearing all the stanzas;
- freezing the display as it is, with new stanzas being ignored;
- unfreezing, which could either adds the pending stanzas since the freeze if there are few, or just don’t bother with that as it wouldn’t be really useful;
- filter stanzas according to their name, direction, payload namespace (for iq or for all), etc.
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