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+# The acme INVERSION, end to end: while a script holds a pane's `event` file
+# open, a middle click in that pane is REPORTED to the script instead of being
+# executed by the editor. That is how an acme client defines its own commands —
+# `Step`, `Run`, `Clear` in examples/acmefs/life.py — and it is the one piece of
+# this filesystem that changes what a click MEANS.
+#
+# The clicked word is `Newcol`, a real pardes builtin, so the two halves of the
+# test cannot be confused with each other: with a reader attached the screen
+# must not change and the record must arrive; with the reader gone the same
+# click must open a column. It sits on the +New pane's first body line — row 5,
+# and the line-number gutter is 7 cells wide, so the word starts at column 8.
+run sh -c 'fusermount3 -u -z /tmp/pardes-acmefs-ev 2>/dev/null; rm -rf /tmp/pardes-acmefs-ev; exit 0'
+start 30 100 --fs=/tmp/pardes-acmefs-ev
+wait 8000 New Newcol
+stable 700 20000
+run sh -c 'M=/tmp/pardes-acmefs-ev; id=$(cut -c1-11 < $M/new/ctl | tr -d " "); echo $id > id.txt; printf "Newcol\n" >> $M/$id/body'
+wait 8000 New Newcol
+stable 700 15000
+# a reader arrives: from here on, buttons 2 and 3 in this pane are its business
+run sh -c 'M=/tmp/pardes-acmefs-ev; id=$(cat id.txt); (cat $M/$id/event > events.txt & echo $! > cat.pid); sleep 1'
+press middle 9 5
+release middle 9 5
+stable 700 15000
+# The screen must be UNCHANGED: no column opened, because the click belonged to
+# the reader. An editor that had performed it would have split the layout.
+snap after-suppressed-click
+# The reader's death is asynchronous: the kernel sends RELEASE when the process
+# closes, and pardes drains filesystem requests in its frame poll, AFTER input.
+# A click delivered in the same wakeup as that RELEASE is therefore still the
+# reader's. One second of sleep is more than the frame this takes.
+run sh -c 'sleep 1; kill $(cat cat.pid) 2>/dev/null; sleep 1; sed -e "s/$/|/" events.txt > ev.txt; exit 0'
+snapfile events ev.txt
+# ...and with the reader gone, the same click is an ordinary Exec again: this
+# one opens the column.
+press middle 9 5
+release middle 9 5
+stable 700 15000
+snap after-unsuppressed-click
+run sh -c 'fusermount3 -u -z /tmp/pardes-acmefs-ev 2>/dev/null; rm -rf /tmp/pardes-acmefs-ev; exit 0'