Split recipient header and Search field in top bar of MessageView when too long

[neiljp]

When the topic is long, or many private recipients, and/or the window is narrow, this can lead to the column for search becoming tall and thin, eg.

 • All messages 790      ┌────────────────────────────────────────────────────┐───────── Users ─────────
 • Private messages      │production help > Email Gateway Stripping Number   S│─────────────────────────
                         │                                                   e│Search people
                         │                                                   a│─────────────────────────
──────── Streams ────────│                                                   r│• 1403865278
─────────────────────────│                                                   c│• Aaditya Arora
Search streams           │                                                   h│• Abhigyan Khaund
─────────────────────────│                                                   :│• Abhishek Kumar Singh
 # announce              │                                                    │• Abhishek P
 # automated testing     │────────────────────────────────────────────────────│• Achiv Chauhan

Rather than rely on columns, we might try another widget - maybe GridFlow would work here?

[bistaastha]

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[bistaastha]

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