N-Shar-ma ed949fbc92 compose: Fix duplicate warning banners for the same private stream. ...

Earlier, a new banner would be showed for each mention of the same
private stream in the compose box. This commit fixes that by checking
if the private stream warning banners already shown include the private
stream just mentioned, and if so, not showing a new banner.

This implementation is in line with the one for warnings for mentions of
users not subscribed to the current stream.

Fixes: #26914.

2024-01-09 10:44:43 -08:00

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