Add framework for scripting tog tests by capturing screen dumps to compare with expected output. Includes some preliminary log view tests but lots more tests are needed to cover diff, blame, tree, ref, and help views. ok stsp@

In diff and blame views, if the user scrolls up during a search, resume search from the first displayed line--not the current match. This makes sense in these views as the "cursor" or current line is the first line. Patch by Mikhail. ok op@

In preparation for wide sha256 support; stsp@ agrees. Change done mechanically with find . -iname \*.[cy] -exec sam {} + X ,x/<sha1\.h>/i/\n#include <sha2.h>

Don't assume commit info is always written. This is only true when diffing a commit against (one of) its direct parent(s). Otherwise we perform an invalid read on a tmp got_diff_line array and end up passing bogus offsets to fseeko(). Bug found and fixed by stsp with a minor tweak by me. ok jamsek for stsp's initial diff ok stsp@

In the case of tog move setlocale(3) before pledge(2), as suggested by stsp. ok stsp@

This fixes an issue reported by Mikhail where CPU usage continuously increases if search is started after the refresh rate has dropped from 100ms to 1s by resetting the 1s refresh rate if search is started after fast initialisation has finished. This is not needed in limit_log_view() because the 1s refresh rate is reset in draw_commits() once the screen is redrawn (i.e., commits_needed == 0). Tested by and based on initial patch from Mikhail. ok stsp@

Suggested by op. tog now supports hscroll in all views so move corresponding keymap docs in tog(1) to global space (this was already the case in tog runtime help). While here, remove some copypasta with a new subroutine to handle hscroll input. ok op@ and stsp@

ok op@ and stsp@

While here, draw to the last column in tog help. ok op@ and stsp@

Reported and tested by dv: rather than print a new line to avoid clobbering the shell prompt when exiting tog with the alternate screen buffer disabled^, adopt naddy's vi(1) solution by looping through visible views to delete the topmost line, which inserts an empty line at the bottom so we don't need to print an empty line to ensure a clean prompt. ^: xterm -xrm 'XTerm*titeInhibit: 1' or run tog in the console ok naddy@

If the diff algorithm, ignore whitespace-only changes, force ASCII text diff, show committer/author, or reference sort order keymaps are toggled, report action to the bottom left of screen. Based on initial patch by Mikhail. ok + tweaks op@

In view_loop(), we initialise at a refresh rate of one tenth per second before dropping to one second updates; the reduction was never hit due to the typo. Reviewed as part of the following diff adding action reports to user events. ok op@

This eliminates the previous performance cost by making 'got log -d' and tog diff view compute the diffstat while building the diff in a temp file like we do with 'got diff -d'. Also, keep the current 'got log -d' UI as per stsp's suggestion. ok stsp@

Use singular form when appropriate; for example, turn the top into the bottom: 1 file changed, 1 insertions(+), 1 deletions(-) 1 file changed, 1 insertion(+), 1 deletion(-) ok op@

Both are already assigned just above in open_diff_view() ok op@