[gnome-builder] libide/code: keep range tree always in-sync

[Christian Hergert <chergert src gnome org>]

commit 295c65ecaf804b89c6172200c91797dee0cb3a2b
Author: Christian Hergert <chergert redhat com>
Date:   Tue Oct 11 14:49:15 2022 -0500

    libide/code: keep range tree always in-sync
    
    Even if we aren't using this to do updates on the highlighting, we want to
    keep it in sync with invalidations.
    
    Also improve the situation with range extraction so that we handle a
    situation where we get to the end of the buffer.
    
    Fixes #1859

 src/libide/code/ide-highlight-engine.c | 40 +++++++++++++++-------------------
 1 file changed, 17 insertions(+), 23 deletions(-)
---
diff --git a/src/libide/code/ide-highlight-engine.c b/src/libide/code/ide-highlight-engine.c
index 1b5666178..8a77476ca 100644
--- a/src/libide/code/ide-highlight-engine.c
+++ b/src/libide/code/ide-highlight-engine.c
@@ -277,19 +277,16 @@ get_unchecked_start_cb (gsize                   offset,
 {
   GetUncheckedRange *range = user_data;
 
-  if (range->offset == G_MAXSIZE)
-    {
-      if (run->data == RUN_UNCHECKED)
-        {
-          range->offset = offset;
-          range->length = run->length;
-        }
+  g_assert (run != NULL);
+  g_assert (run->length > 0);
 
-      return FALSE;
-    }
-  else if (run->data == RUN_UNCHECKED &&
-           range->offset + range->length == offset)
+  if (range->offset == G_MAXSIZE && run->data == RUN_CHECKED)
+    return FALSE;
+
+  if (run->data == RUN_UNCHECKED)
     {
+      if (range->offset == G_MAXSIZE)
+        range->offset = offset;
       range->length += run->length;
       return FALSE;
     }
@@ -303,17 +300,17 @@ get_next_range (CjhTextRegion *region,
                 GtkTextIter   *begin,
                 GtkTextIter   *end)
 {
-  GetUncheckedRange range = {G_MAXSIZE, G_MAXSIZE};
+  GetUncheckedRange range = {G_MAXSIZE, 0};
 
   _cjh_text_region_foreach (region, get_unchecked_start_cb, &range);
 
-  if (range.offset == G_MAXSIZE)
+  if (range.length == 0 || range.offset == G_MAXSIZE)
     return FALSE;
 
   gtk_text_buffer_get_iter_at_offset (buffer, begin, range.offset);
   gtk_text_buffer_get_iter_at_offset (buffer, end, range.offset + range.length);
 
-  return TRUE;
+  return !gtk_text_iter_equal (begin, end);
 }
 
 static gboolean
@@ -407,9 +404,10 @@ ide_highlight_engine_queue_work (IdeHighlightEngine *self)
 {
   g_autoptr(GtkTextBuffer) buffer = NULL;
 
+  g_assert (IDE_IS_MAIN_THREAD ());
   g_assert (IDE_IS_HIGHLIGHT_ENGINE (self));
 
-  if (self->work_scheduled != 0 || self->highlighter == NULL)
+  if (!self->enabled || self->work_scheduled != 0 || self->highlighter == NULL)
     return;
 
   if (!(buffer = g_weak_ref_get (&self->buffer_wref)))
@@ -609,8 +607,7 @@ ide_highlight_engine_insert_before_cb (IdeBuffer *buffer,
 
   g_assert (IDE_IS_HIGHLIGHT_ENGINE (self));
 
-  if (self->enabled)
-    _cjh_text_region_insert (self->region, offset, length, RUN_UNCHECKED);
+  _cjh_text_region_insert (self->region, offset, length, RUN_UNCHECKED);
 }
 
 static void
@@ -623,8 +620,7 @@ ide_highlight_engine_insert_after_cb (IdeBuffer *buffer,
 
   g_assert (IDE_IS_HIGHLIGHT_ENGINE (self));
 
-  if (self->enabled)
-    mark_unchecked (self, buffer, offset, length);
+  mark_unchecked (self, buffer, offset, length);
 }
 
 static void
@@ -637,8 +633,7 @@ ide_highlight_engine_delete_before_cb (IdeBuffer *buffer,
 
   g_assert (IDE_IS_HIGHLIGHT_ENGINE (self));
 
-  if (self->enabled)
-    _cjh_text_region_remove (self->region, offset, length);
+  _cjh_text_region_remove (self->region, offset, length);
 }
 
 static void
@@ -651,8 +646,7 @@ ide_highlight_engine_delete_after_cb (IdeBuffer *buffer,
 
   g_assert (IDE_IS_HIGHLIGHT_ENGINE (self));
 
-  if (self->enabled)
-    mark_unchecked (self, buffer, offset, 0);
+  mark_unchecked (self, buffer, offset, 0);
 }
 
 static void