Issue #3206643 by fjgarlin, Lal_, AJV009, quietone, benjifisher, mohit_aghera, larowlan, VladimirAus, mherchel, xjm, alexpott, Rishabh Vishwakarma, ckrina, rkoller, Gábor Hojtsy, smustgrave, AkshayAdhav, hestenet, irinaz, AaronMcHale, andrewmacpherson, longwave, catch, shaal, nod_, drumm: Project messaging channel in core (as experimental)

Issue #3215836 by guilhermevp, imalabya, swatichouhan012, AJV009, joachim, quietone: add a constant to represent uncountable sources for SourcePluginBase::count()

Revert "Issue #3199730 by mohit_aghera, Abhijith S, AJV009, Gauravmahlawat, shriaas2898, pameeela, roman-yrv, ranjith_kumar_k_u, Kumar Ashutosh, ilgnerfagundes: Views block description is double-escaped if display name is set"

This reverts commit fd9f7081.

Issue #3199730 by mohit_aghera, Abhijith S, AJV009, Gauravmahlawat, shriaas2898, pameeela, roman-yrv, ranjith_kumar_k_u, Kumar Ashutosh, ilgnerfagundes: Views block description is double-escaped if display name is set