Backport: Bug [#2095]. gtk: Accessible: emit the text deletion signal before deletion

This allows the accessibility layer to request detail, such as which
characters have been deleted.  ATK will query the deleted range to
report the data that was removed, so it must still be available for
the query to give a correct answer.
So, emit the signal in BEFOREDELETE instead of DELETETEXT.

Backport of changeset 7406:0a937b4c0b2b.

3 files changed, 7 insertions, 9 deletions

diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index 8aa71263e..262813ab1 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -570,6 +570,10 @@
 	<a href="https://sourceforge.net/p/scintilla/bugs/2094/">Bug #2094</a>.
 	</li>
  	<li>
+	Fix text reported for deletion with accessibility on GTK.
+	<a href="https://sourceforge.net/p/scintilla/bugs/2095/">Bug #2095</a>.
+	</li>
+ 	<li>
 	Fix flicker when inserting primary selection on GTK.
 	<a href="https://sourceforge.net/p/scintilla/bugs/2087/">Bug #2087</a>.
 	</li>
diff --git a/gtk/ScintillaGTKAccessible.cxx b/gtk/ScintillaGTKAccessible.cxx
index 7e93b8a5e..f9cedcb82 100644
--- a/gtk/ScintillaGTKAccessible.cxx
+++ b/gtk/ScintillaGTKAccessible.cxx
@@ -160,7 +160,6 @@ ScintillaGTKAccessible *ScintillaGTKAccessible::FromAccessible(GtkAccessible *ac
 ScintillaGTKAccessible::ScintillaGTKAccessible(GtkAccessible *accessible_, GtkWidget *widget_) :
 		accessible(accessible_),
 		sci(ScintillaGTK::FromWidget(widget_)),
-		deletionLengthChar(0),
 		old_pos(-1) {
 	SetAccessibility(true);
 	g_signal_connect(widget_, "sci-notify", G_CALLBACK(SciNotify), this);
@@ -886,14 +885,11 @@ void ScintillaGTKAccessible::Notify(GtkWidget *, gint, SCNotification *nt) {
 				UpdateCursor();
 			}
 			if (nt->modificationType & SC_MOD_BEFOREDELETE) {
-				// We cannot compute the deletion length in DELETETEXT as it requires accessing the
-				// buffer, so that the character are still present.  So, we cache the value here,
-				// and use it in DELETETEXT that fires quickly after.
-				deletionLengthChar = sci->pdoc->CountCharacters(nt->position, nt->position + nt->length);
+				int startChar = CharacterOffsetFromByteOffset(nt->position);
+				int lengthChar = sci->pdoc->CountCharacters(nt->position, nt->position + nt->length);
+				g_signal_emit_by_name(accessible, "text-changed::delete", startChar, lengthChar);
 			}
 			if (nt->modificationType & SC_MOD_DELETETEXT) {
-				int startChar = CharacterOffsetFromByteOffset(nt->position);
-				g_signal_emit_by_name(accessible, "text-changed::delete", startChar, deletionLengthChar);
 				UpdateCursor();
 			}
 			if (nt->modificationType & SC_MOD_CHANGESTYLE) {
diff --git a/gtk/ScintillaGTKAccessible.h b/gtk/ScintillaGTKAccessible.h
index 00570acce..b9d94b0e2 100644
--- a/gtk/ScintillaGTKAccessible.h
+++ b/gtk/ScintillaGTKAccessible.h
@@ -18,8 +18,6 @@ private:
 	GtkAccessible *accessible;
 	ScintillaGTK *sci;
 
-	// cached length of the deletion, in characters (see Notify())
-	int deletionLengthChar;
 	// local state for comparing
 	Sci::Position old_pos;
 	std::vector<SelectionRange> old_sels;