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optimized screen refreshing/redrawing
* pressing e.g. TAB when the popup is showing a list of auto-completions
will show the next page, eventually beginning at the first one again.
* do not redraw curses windows in the UI methods directly. this resulted
in flickering during command-line editing macros and ordinary macro calls
because the physical screen was updated immediately.
Instead, window refreshing and updated is done centrally in
event_loop_iter() only after a key has been processed.
Also we use wnoutrefresh() and doupdate() to send as little to the
terminal (emulator) as possible.
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* simplified code
* fixed spurious empty lines in the popup which truncated file names/tokens
that would otherwise be displayed
* fixed memleak when freeing the popup entry list
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the QUIT hook is actually not that trivial and required
some architectural changes.
First, the QUIT hook execution and any error that might
occurr cannot always be attached to an existing error stack
frame. Thereforce, to give a stack frame for QUIT hooks and
to improve the readability of error traces for ED hooks in general,
a special EDHookFrame is added to every ED hook execution error.
Secondly, since QUIT hooks can themselves throw errors, we cannot
run it from an atexit() handler. Instead it's always called manually
before __successful__ program termination. An error in a QUIT hook
will result in a failure return code nevertheless.
Thirdly, errors in QUIT hooks should not prevent program termination
(in interactive mode), therefore they are only invoked from main()
and always in batch mode. I.e. if the interactive mode is terminated
(EX$$), SciTECO will switch back to batch mode and run the QUIT
hook there. This is also symmetric to program startup, which is
always in batch mode.
This means that Interface::event_loop() no longer runs indefinitely.
If it returns, this signals that the interface shut down and
batch mode may be restored by SciTECO.
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* does not change ./configure parameters
You still have to specifiy --with-interface=ncurses for
the Curses interface with default settings
* the "NCurses" UI was used for many different Curses
variants, so plain "Curses" is a better name.
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