x11-libs/vte: backport upstream repainting patch

If you are using gnome-terminal or xfce4-terminal, you may have hit a
bug in vte3.  A fix is around since at least 2010, which found its way
into some (but not all) distribution packages, and even into upstream
(3 years later, but unchanged).

Bug: https://bugzilla.gnome.org/show_bug.cgi?=542087
Bug: https://github.com/mobile-shell/mosh/issues/660
Closes: https://github.com/gentoo/gentoo/pull/2444
Commit: https://git.gnome.org/browse/vte/commit/?id=88e8e89560a62d0981ce2b18974a230d0a07dbdd
Source: https://github.com/pld-linux/vte0/commit/1e8dce16b239e5d378b02e4d04a60e823df36257

1 files changed, 86 insertions, 0 deletions

diff --git a/x11-libs/vte/files/vte-0.28.2-repaint-after-change-scroll-region.patch b/x11-libs/vte/files/vte-0.28.2-repaint-after-change-scroll-region.patch
new file mode 100644
index 000000000000..86e547103ad7
--- /dev/null
+++ b/x11-libs/vte/files/vte-0.28.2-repaint-after-change-scroll-region.patch
@@ -0,0 +1,86 @@
+https://git.gnome.org/browse/vte/commit/?id=88e8e89560a62d0981ce2b18974a230d0a07dbdd
+
+From 88e8e89560a62d0981ce2b18974a230d0a07dbdd Mon Sep 17 00:00:00 2001
+From: Micah Cowan <micah@cowan.name>
+Date: Tue, 22 Oct 2013 23:30:43 +0200
+Subject: widget: Fix invalidation region
+
+When the sequence handler moves the cursor into the restricted scrolling region,
+the bbox needs to be reset, too.
+Fixes glitches with interspersing writes to the bottom line with scrolls of the
+upper region, and also fixes missing screen redraws when using mosh.
+
+https://bugzilla.gnome.org/show_bug.cgi?id=542087
+https://bugzilla.gnome.org/show_bug.cgi?id=686097
+
+diff --git a/src/vte.c b/src/vte.c
+index 9f6d7d8..a4d9d25 100644
+--- a/src/vte.c
++++ b/src/vte.c
+@@ -4077,6 +4077,7 @@ vte_terminal_process_incoming(VteTerminal *terminal)
+ 	long wcount, start, delta;
+ 	gboolean leftovers, modified, bottom, again;
+ 	gboolean invalidated_text;
++	gboolean in_scroll_region;
+ 	GArray *unichars;
+ 	struct _vte_incoming_chunk *chunk, *next_chunk, *achunk = NULL;
+ 
+@@ -4096,6 +4097,10 @@ vte_terminal_process_incoming(VteTerminal *terminal)
+ 	cursor = screen->cursor_current;
+ 	cursor_visible = terminal->pvt->cursor_visible;
+ 
++	in_scroll_region = screen->scrolling_restricted
++	    && (screen->cursor_current.row >= (screen->insert_delta + screen->scrolling_region.start))
++	    && (screen->cursor_current.row <= (screen->insert_delta + screen->scrolling_region.end));
++
+ 	/* We should only be called when there's data to process. */
+ 	g_assert(terminal->pvt->incoming ||
+ 		 (terminal->pvt->pending->len > 0));
+@@ -4194,6 +4199,8 @@ skip_chunk:
+ 		 * points to the first character which isn't part of this
+ 		 * sequence. */
+ 		if ((match != NULL) && (match[0] != '\0')) {
++			gboolean new_in_scroll_region;
++
+ 			/* Call the right sequence handler for the requested
+ 			 * behavior. */
+ 			_vte_terminal_handle_sequence(terminal,
+@@ -4204,12 +4211,21 @@ skip_chunk:
+ 			start = (next - wbuf);
+ 			modified = TRUE;
+ 
+-			/* if we have moved during the sequence handler, restart the bbox */
++			new_in_scroll_region = screen->scrolling_restricted
++			    && (screen->cursor_current.row >= (screen->insert_delta + screen->scrolling_region.start))
++			    && (screen->cursor_current.row <= (screen->insert_delta + screen->scrolling_region.end));
++
++			delta = screen->scroll_delta;	/* delta may have changed from sequence. */
++
++			/* if we have moved greatly during the sequence handler, or moved
++                         * into a scroll_region from outside it, restart the bbox.
++                         */
+ 			if (invalidated_text &&
+-					(screen->cursor_current.col > bbox_bottomright.x + VTE_CELL_BBOX_SLACK ||
+-					 screen->cursor_current.col < bbox_topleft.x - VTE_CELL_BBOX_SLACK     ||
+-					 screen->cursor_current.row > bbox_bottomright.y + VTE_CELL_BBOX_SLACK ||
+-					 screen->cursor_current.row < bbox_topleft.y - VTE_CELL_BBOX_SLACK)) {
++					((new_in_scroll_region && !in_scroll_region) ||
++					 (screen->cursor_current.col > bbox_bottomright.x + VTE_CELL_BBOX_SLACK ||
++					  screen->cursor_current.col < bbox_topleft.x - VTE_CELL_BBOX_SLACK     ||
++					  screen->cursor_current.row > bbox_bottomright.y + VTE_CELL_BBOX_SLACK ||
++					  screen->cursor_current.row < bbox_topleft.y - VTE_CELL_BBOX_SLACK))) {
+ 				/* Clip off any part of the box which isn't already on-screen. */
+ 				bbox_topleft.x = MAX(bbox_topleft.x, 0);
+ 				bbox_topleft.y = MAX(bbox_topleft.y, delta);
+@@ -4229,6 +4245,8 @@ skip_chunk:
+ 				bbox_bottomright.x = bbox_bottomright.y = -G_MAXINT;
+ 				bbox_topleft.x = bbox_topleft.y = G_MAXINT;
+ 			}
++
++			in_scroll_region = new_in_scroll_region;
+ 		} else
+ 		/* Second, we have a NULL match, and next points to the very
+ 		 * next character in the buffer.  Insert the character which
+-- 
+cgit v0.10.2
+