[PATCH] vi: allow manual screen update if SIGWINCH isn't supported

[Ron Yorston]

On platforms that don't support SIGWINCH vi can be configured
with FEATURE_VI_USE_SIGNALS disabled and FEATURE_VI_WIN_RESIZE
enabled.  This allows the user to force an update with ^L when
the screen is resized.

However, because the SIGWINCH handler hasn't run the virtual
screen buffer won't have been updated and the display becomes
corrupted.  Fix this by calling new_screen() if necessary.

Signed-off-by: Ron Yorston <rmuy at pobox.com>
---
 editors/vi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/editors/vi.c b/editors/vi.c
index 065a1068e..eee36030e 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -3348,7 +3348,15 @@ static void refresh(int full_screen)
 	if (ENABLE_FEATURE_VI_WIN_RESIZE IF_FEATURE_VI_ASK_TERMINAL(&& !G.get_rowcol_error) ) {
 		unsigned c = columns, r = rows;
 		query_screen_dimensions();
+#if ENABLE_FEATURE_VI_USE_SIGNALS
 		full_screen |= (c - columns) | (r - rows);
+#else
+		if (c != columns || r != rows) {
+			/* update screen memory since SIGWINCH won't have done it */
+			full_screen = TRUE;
+			new_screen(rows, columns);
+		}
+#endif
 	}
 	sync_cursor(dot, &crow, &ccol);	// where cursor will be (on "dot")
 	tp = screenbegin;	// index into text[] of top line
-- 
2.20.1