From b2935e2b89cf999d64a6322f58d6bf4307371463 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Sun, 12 Jan 2020 12:19:38 +0100
Subject: [PATCH] render: add render_{enable,disable}_refresh()

Calling render_disable_refresh() causes update requests to that
terminal to be ignored.

Calling render_enable_refresh() re-enables updates.
---
 render.c   | 24 ++++++++++++++++++++++++
 render.h   |  2 ++
 terminal.h |  1 +
 3 files changed, 27 insertions(+)

diff --git a/render.c b/render.c
index 5f2aff69..26da8d83 100644
--- a/render.c
+++ b/render.c
@@ -1015,6 +1015,9 @@ render_resize(struct terminal *term, int width, int height)
     if (width == term->width && height == term->height && scale == term->scale)
         return;
 
+    /* Cancel an application initiated "Synchronized Update" */
+    render_enable_refresh(term);
+
     term->width = width;
     term->height = height;
     term->scale = scale;
@@ -1190,6 +1193,9 @@ fdm_hook_refresh_pending_terminals(struct fdm *fdm, void *data)
         if (!term->render.refresh_needed)
             continue;
 
+        if (term->render.refresh_prohibited)
+            continue;
+
         assert(term->window->is_configured);
         term->render.refresh_needed = false;
 
@@ -1235,6 +1241,24 @@ render_refresh(struct terminal *term)
     term->render.refresh_needed = true;
 }
 
+void
+render_disable_refresh(struct terminal *term)
+{
+    if (term->render.refresh_prohibited)
+        return;
+
+    term->render.refresh_prohibited = true;
+}
+
+void
+render_enable_refresh(struct terminal *term)
+{
+    if (!term->render.refresh_prohibited)
+        return;
+
+    term->render.refresh_prohibited = false;
+}
+
 bool
 render_xcursor_set(struct terminal *term)
 {
diff --git a/render.h b/render.h
index 43f5314e..59bae895 100644
--- a/render.h
+++ b/render.h
@@ -11,6 +11,8 @@ void render_destroy(struct renderer *renderer);
 void render_resize(struct terminal *term, int width, int height);
 void render_set_title(struct terminal *term, const char *title);
 void render_refresh(struct terminal *term);
+void render_disable_refresh(struct terminal *term);
+void render_enable_refresh(struct terminal *term);
 bool render_xcursor_set(struct terminal *term);
 
 void render_search_box(struct terminal *term);
diff --git a/terminal.h b/terminal.h
index 8e47826b..0296ff66 100644
--- a/terminal.h
+++ b/terminal.h
@@ -292,6 +292,7 @@ struct terminal {
         bool refresh_needed;  /* Terminal needs to be re-rendered, as soon-as-possible */
         int scrollback_lines; /* Number of scrollback lines, from conf (TODO: move out from render struct?) */
 
+        bool refresh_prohibited;
         /* Render threads + synchronization primitives */
         struct {
             size_t count;