echo: Update is_me_message flag when we get messages back from server.
echo: Update is_me_message flag when we get messages back from server.

Fixes #12450.

timabbott/zulip,punchagan/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,andersk/zulip,punchagan/zulip,timabbott/zulip,showell/zulip,punchagan/zulip,zulip/zulip,rishig/zulip,shubhamdhama/zulip,hackerkid/zulip,shubhamdhama/zulip,andersk/zulip,brainwane/zulip,shubhamdhama/zulip,hackerkid/zulip,andersk/zulip,kou/zulip,rht/zulip,brainwane/zulip,rishig/zulip,brainwane/zulip,showell/zulip,rht/zulip,timabbott/zulip,timabbott/zulip,andersk/zulip,andersk/zulip,tommyip/zulip,hackerkid/zulip,eeshangarg/zulip,synicalsyntax/zulip,tommyip/zulip,shubhamdhama/zulip,synicalsyntax/zulip,eeshangarg/zulip,punchagan/zulip,shubhamdhama/zulip,brainwane/zulip,punchagan/zulip,brainwane/zulip,tommyip/zulip,showell/zulip,kou/zulip,zulip/zulip,synicalsyntax/zulip,punchagan/zulip,synicalsyntax/zulip,brainwane/zulip,hackerkid/zulip,andersk/zulip,tommyip/zulip,synicalsyntax/zulip,andersk/zulip,rishig/zulip,punchagan/zulip,kou/zulip,hackerkid/zulip,zulip/zulip,rht/zulip,showell/zulip,tommyip/zulip,eeshangarg/zulip,showell/zulip,timabbott/zulip,timabbott/zulip,shubhamdhama/zulip,tommyip/zulip,tommyip/zulip,rishig/zulip,rishig/zulip,shubhamdhama/zulip,rishig/zulip,showell/zulip,showell/zulip,zulip/zulip,hackerkid/zulip,rht/zulip,synicalsyntax/zulip,kou/zulip,rht/zulip,kou/zulip,rht/zulip,hackerkid/zulip,kou/zulip,zulip/zulip,rishig/zulip,brainwane/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,synicalsyntax/zulip,timabbott/zulip,zulip/zulip