#481: chatbox should has memory

[lidaobing]

/closes #481

[codecov]

Codecov Report

Merging #483 (200068d) into master (90d4130) will decrease coverage by 0.00%.
The diff coverage is 29.62%.

@@            Coverage Diff             @@
##           master     #483      +/-   ##
==========================================
- Coverage   44.51%   44.51%   -0.01%     
==========================================
  Files          67       67              
  Lines        7701     7719      +18     
==========================================
+ Hits         3428     3436       +8     
- Misses       4273     4283      +10     

Impacted Files	Coverage Δ
src/iptux/DialogBase.h	0.00% <ø> (ø)
src/iptux/MainWindow.cpp	26.86% <5.55%> (-0.04%)	⬇️
src/iptux/Application.cpp	42.63% <12.50%> (ø)
src/iptux/UiCoreThread.cpp	46.22% <15.62%> (-1.71%)	⬇️
src/iptux/DialogGroup.cpp	38.97% <33.33%> (ø)
src/iptux/DialogPeer.cpp	48.56% <50.00%> (-0.27%)	⬇️
src/iptux/DialogBase.cpp	38.32% <100.00%> (+0.16%)	⬆️
src/iptux/UiModels.cpp	30.15% <100.00%> (+1.08%)	⬆️
src/iptux/UiModels.h	100.00% <100.00%> (ø)
src/iptux-core/CoreThread.cpp	69.82% <0.00%> (+0.24%)	⬆️

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