We were preserving the history in that case, so on fifo buffers
(that set the NoUndo flag until the fifo is closed), we still had
the history from the "previous life" of the buffer, leading crashes
when trying to apply it.
Fixes#1518
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Regression test
===============
:unified-context-diff: https://en.wikipedia.org/wiki/Diff#Unified_format
Source structure
----------------
----------------------------------------------
.
├── unit
│ └── …
└── compose
└── …
├── cmd → command
├── [in] → start file
├── [out] → end file
├── [selections] → selection contents
├── [state] → selection states
└── [rc] → configuration
----------------------------------------------
Usage
-----
To test, just type +run [test]+ in the +test+ directory.
It will print each passing test. If a test fails, a {unified-context-diff}[unified context diff]
is printed showing the test’s expected output and the actual output.
fc64369f9d