* decouple interactive mode from cursor position.
* clear readonly when entering interactive mode and
restore when leaving it.
* simplify navigation logic by removing offset-based toggling.
* set pager mode on interactive shell exit.
* check for active processes in shell buffers before reusing them,
and prompt the user to kill the running process to avoid leaving
it detached and unreachable.
fixes a race condition where pty data was lost on process exit.
The pid callback now flags the exit status, while `shell_read_cb`
handles the final teardown. This prevents truncation for
high-throughput processes.
* fix bug on screen resize with default dired layout
* fix resize bug: vertical layout changed when screen width was adjusted
* rename `update_split_ratio` as `compute_virtual_window_size`
* remove `update_all_split_ratios` and `restore_coordinate_from_ratio`
* recompute window size in more necessary places
* use character sizes for minimum window width/height
* show virtual window size in `describe-window`
* add `C-x V` binding for `shrink-window`
The `occur` command creates an `*occur*` buffer to show the matches in the current buffer.
If we used `occur` to search another string, then the old *occur* buffer was still there and our new search result were not shown. Killing buffer `*occur*` before creating a new one solves the problem.
In the signal handler for the signal SIGWINCH tty_term_resize, we call
tty_dpy_invalidate function. In this function, we change the screen_size
and other critical fields.
While the process is executing the function tty_dpy_flush, and another
SIGWINCH occurs, then the screen_size is changed. And tty_dpy_flush will
access invalid memory which leads to coredump.
In the signal hander of SIGWINCH, we only need to set the flag
complete_refresh.
* fix crash on "https://support.apple.com/kb/HT208050"
* add missing initializer (stupid oversight)
* fix bogus overflow test (another nasty bug waiting to bite)
We desperately need warnings or idioms against such stupid errors.
Using constructors for all locally defined structures seems advidsable,
* use complete list of internal commands
* use tcl specific word parser
* fix quoted and braced string parsers
* improve variable colorizer
* add custom cases in probe function
* add `ustr_match_str`
