File vim-8.2.3607-revert-gtk3-code-removal.patch of Package vim.31592

From d3d3309464edf470cece3e4b698e89e62d036274 Mon Sep 17 00:00:00 2001
From: Tamara Schmitz <tschmitz@suse.de>
Date: Wed, 17 May 2023 16:04:11 +0200
Subject: [PATCH] Revert "patch 8.2.3607: GTK3 screen updating is slow"
    
    This reverts commit 9459b8d461d6f8345bfa3fb9b3b4297a7950b0bc.

---
 src/gui.h         |  1 +
 src/gui_gtk_x11.c | 89 ++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 86 insertions(+), 4 deletions(-)

diff --git a/src/gui.h b/src/gui.h
index aecba27d8..b3ce046ac 100644
--- a/src/gui.h
+++ b/src/gui.h
@@ -376,6 +376,7 @@ typedef struct Gui
 # endif
 # ifdef USE_GTK3
     cairo_surface_t *surface;       // drawarea surface
+    gboolean        by_signal;     // cause of draw operation
 # else
     GdkGC	*text_gc;	    // cached GC for normal text
 # endif
diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index 7ef63b842..fab74621e 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -755,6 +755,46 @@ visibility_event(GtkWidget *widget UNUSED,
  * Redraw the corresponding portions of the screen.
  */
 #if GTK_CHECK_VERSION(3,0,0)
+static gboolean is_key_pressed = FALSE;
+static gboolean blink_mode = TRUE;
+
+static gboolean gui_gtk_is_blink_on(void);
+
+    static void
+gui_gtk3_redraw(int x, int y, int width, int height)
+{
+    // Range checks are left to gui_redraw_block()
+    gui_redraw_block(Y_2_ROW(y), X_2_COL(x),
+	    Y_2_ROW(y + height - 1), X_2_COL(x + width - 1),
+	    GUI_MON_NOCLEAR);
+}
+
+    static void
+gui_gtk3_update_cursor(cairo_t *cr)
+{
+    if (gui.row == gui.cursor_row)
+    {
+	gui.by_signal = TRUE;
+	if (State & MODE_CMDLINE)
+	    gui_update_cursor(TRUE, FALSE);
+	else
+	    gui_update_cursor(TRUE, TRUE);
+	gui.by_signal = FALSE;
+	cairo_paint(cr);
+    }
+}
+
+    static gboolean
+gui_gtk3_should_draw_cursor(void)
+{
+    unsigned int cond = 0;
+    cond |= gui_gtk_is_blink_on();
+    if (gui.cursor_col >= gui.col)
+	cond |= is_key_pressed;
+    cond |= gui.in_focus == FALSE;
+    return  cond;
+}
+
     static gboolean
 draw_event(GtkWidget *widget UNUSED,
 	   cairo_t   *cr,
@@ -769,6 +809,8 @@ draw_event(GtkWidget *widget UNUSED,
 
     cairo_set_source_surface(cr, gui.surface, 0, 0);
 
+    // Draw the window without the cursor.
+    gui.by_signal = TRUE;
     {
 	cairo_rectangle_list_t *list = NULL;
 
@@ -777,16 +819,47 @@ draw_event(GtkWidget *widget UNUSED,
 	{
 	    int i;
 
+	    // First clear all the blocks and then redraw them.  Just in case
+	    // some blocks overlap.
+	    for (i = 0; i < list->num_rectangles; i++)
+	    {
+		const cairo_rectangle_t rect = list->rectangles[i];
+
+		gui_mch_clear_block(Y_2_ROW((int)rect.y), 0,
+			Y_2_ROW((int)(rect.y + rect.height)) - 1, Columns - 1);
+	    }
+
 	    for (i = 0; i < list->num_rectangles; i++)
 	    {
-		const cairo_rectangle_t *rect = &list->rectangles[i];
-		cairo_rectangle(cr, rect->x, rect->y,
-						    rect->width, rect->height);
-		cairo_fill(cr);
+		const cairo_rectangle_t rect = list->rectangles[i];
+
+		if (blink_mode)
+		    gui_gtk3_redraw(rect.x, rect.y, rect.width, rect.height);
+		else
+		{
+		    if (get_real_state() & MODE_VISUAL)
+			gui_gtk3_redraw(rect.x, rect.y,
+				rect.width, rect.height);
+		    else
+			gui_redraw(rect.x, rect.y, rect.width, rect.height);
+		}
 	    }
 	}
 	cairo_rectangle_list_destroy(list);
+
+	if (get_real_state() & MODE_VISUAL)
+	{
+	    if (gui.cursor_row == gui.row && gui.cursor_col >= gui.col)
+		gui_update_cursor(TRUE, TRUE);
+	}
+
+	cairo_paint(cr);
     }
+    gui.by_signal = FALSE;
+
+    // Add the cursor to the window if necessary.
+    if (gui_gtk3_should_draw_cursor() && blink_mode)
+	gui_gtk3_update_cursor(cr);
 
     return FALSE;
 }
@@ -911,6 +984,14 @@ static long_u blink_ontime = 400;
 static long_u blink_offtime = 250;
 static guint blink_timer = 0;
 
+#if GTK_CHECK_VERSION(3,0,0)
+    static gboolean
+gui_gtk_is_blink_on(void)
+{
+    return blink_state == BLINK_ON;
+}
+#endif
+
     int
 gui_mch_is_blinking(void)
 {
-- 
2.26.2