VcsBase: Abort commands when closing VcsBaseEditorWidget
VcsBase: Abort commands when closing VcsBaseEditorWidget

This prevents the crashes when the command signals a state change
after the managing editor was closed.

Task-number: QTCREATORBUG-10343
Change-Id: I57e34c49d5ef8b5693bec6ac0ebc9d87afa99dc9
Reviewed-by: Orgad Shaneh <2b010cbad792a0c0a8175f752f93f83941fc6bc1@gmail.com>

maui-packages/qt-creator,danimo/qt-creator,kuba1/qtcreator,maui-packages/qt-creator,richardmg/qtcreator,xianian/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,darksylinc/qt-creator,Distrotech/qtcreator,amyvmiwei/qt-creator,farseerri/git_code,maui-packages/qt-creator,maui-packages/qt-creator,kuba1/qtcreator,Distrotech/qtcreator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,darksylinc/qt-creator,Distrotech/qtcreator,omniacreator/qtcreator,colede/qtcreator,danimo/qt-creator,martyone/sailfish-qtcreator,darksylinc/qt-creator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,colede/qtcreator,xianian/qt-creator,darksylinc/qt-creator,kuba1/qtcreator,danimo/qt-creator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,richardmg/qtcreator,omniacreator/qtcreator,omniacreator/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,kuba1/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,richardmg/qtcreator,darksylinc/qt-creator,richardmg/qtcreator,Distrotech/qtcreator,colede/qtcreator,darksylinc/qt-creator,martyone/sailfish-qtcreator,farseerri/git_code,xianian/qt-creator,colede/qtcreator,maui-packages/qt-creator,farseerri/git_code,colede/qtcreator,danimo/qt-creator,omniacreator/qtcreator,AltarBeastiful/qt-creator,kuba1/qtcreator,omniacreator/qtcreator,richardmg/qtcreator,colede/qtcreator,darksylinc/qt-creator,omniacreator/qtcreator,maui-packages/qt-creator,farseerri/git_code,maui-packages/qt-creator,farseerri/git_code,kuba1/qtcreator,AltarBeastiful/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,danimo/qt-creator,danimo/qt-creator,farseerri/git_code,danimo/qt-creator,danimo/qt-creator,richardmg/qtcreator,xianian/qt-creator,kuba1/qtcreator,farseerri/git_code,Distrotech/qtcreator,richardmg/qtcreator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,Distrotech/qtcreator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,colede/qtcreator,farseerri/git_code,xianian/qt-creator,darksylinc/qt-creator,amyvmiwei/qt-creator,omniacreator/qtcreator,AltarBeastiful/qt-creator,kuba1/qtcreator