=== pressed the divider
 File  Go ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁
Filter      │new task…                              Add
(o) All░░░░░│ ribbon: click the text, it falls through ·
( ) Open    │»[x] build the reconciler                #2
( ) Done    │»[ ] lay it out                          #3
┌──────────┐│»[ ] route the pointer                   #4
│clip-test ││»[ ] wire up focus                       #5
└──────────┘│
            │
            │
            │
            │
 alpha · visit 1
5 tasks · light · synced 0 · ready

=== dragged right — the pointer left the divider's own column
 File  Go ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁
Filter              │new task…                      Add
(o) All░░░░░░░░░░░░░│ ribbon: click the text, it falls t
( ) Open            │»[x] build the reconciler        #2
( ) Done            │»[ ] lay it out                  #3
┌──────────┐        │»[ ] route the pointer           #4
│clip-test │        │»[ ] wire up focus               #5
└──────────┘        │
                    │
                    │
                    │
                    │
 alpha · visit 1
5 tasks · light · synced 0 · ready

=== and back left, over an unrelated widget
 File  Go ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁
Filter  │new task…                                  Add
(o) All░│ ribbon: click the text, it falls through · las
( ) Open│»[x] build the reconciler                    #2
( ) Done│»[ ] lay it out                              #3
┌──────┐│»[ ] route the pointer                       #4
│clip-t││»[ ] wire up focus                           #5
└──────┘│
        │
        │
        │
        │
 alpha · visit 1
5 tasks · light · synced 0 · ready

=== released: moving no longer resizes
 File  Go ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁
Filter  │new task…                                  Add
(o) All░│ ribbon: click the text, it falls through · las
( ) Open│»[x] build the reconciler                    #2
( ) Done│»[ ] lay it out                              #3
┌──────┐│»[ ] route the pointer                       #4
│clip-t││»[ ] wire up focus                           #5
└──────┘│
        │
        │
        │
        │
 alpha · visit 1
5 tasks · light · synced 0 · ready

