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* there was a dependency on interface initialization.
it did not cause issues because destruction order was
by chance.
* introduced INIT_PRIO and PRIO_* macros to easy initialization order declaration
(using a PRIO_* formula makes code self-documenting)
* also used this to clean up QRegisterTable initialization
(we do not need the explicit initialize() method)
* also used to clean up symbols initialization
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memory mapping the entire file has been benchmarked to be less
efficient than the old implementation (because of more than
doubling page faults).
A lengthy comment has been written to discuss different
implementations of file reading.
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* file must be in primary memory for scintilla
* we cannot write to scintilla's buffer memory directly
* so mapping the file is best: in the best case it is not copied to primary memory and resides in kernel cache
* in any case, mapping to memory is faster than read()ing into primary memory
* copying from mapped virtual memory to scintilla buffer (via SCI_APPENDTEXT) is faster
than copying from primary memory
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* works with/without save-points (i.e. in batch and interactive mode, both were broken)
* improved file-saving performance (avoid buffer gap removal)
* only root can preserve the ownership of a file owned by another user after file saving
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