Make DEPM respect current cursor position.

Spaces are now conserved when they surround current cursor. Examples:
  abc   |   def
becomes
  abc | def
after DEPM and
  abc |
is kept as it is.

Fixes ticket #11412.

(cherry picked from commit dff0c5729e)

src/Text2.cpp

@@ -850,7 +850,7 @@ bool Text::deleteEmptyParagraphMechanism(Cursor & cur,
 		&& old.pos() == cur[depth].pos();
 
 	// If the chars around the old cursor were spaces, delete some of
-	// them , but only if the cursor has really moved.
+	// them, but only if the cursor has really moved.
 	if (!same_par_pos) {
 		// find range of spaces around cursors
 		int from = old.pos();
@@ -868,6 +868,9 @@ bool Text::deleteEmptyParagraphMechanism(Cursor & cur,
 		if (from != to && from > 0 && to < oldpar.size())
 			++from;
 
+		if (same_par && cur.pos() > from && cur.pos() < to)
+			++from;
+
 		// Remove spaces and adapt cursor.
 		if (from < to) {
 			oldpar.eraseChars(from, to, cur.buffer()->params().track_changes);
@@ -884,7 +887,7 @@ bool Text::deleteEmptyParagraphMechanism(Cursor & cur,
 		}
 	}
 
-	// only do our magic if we changed paragraph
+	// only do our other magic if we changed paragraph
 	if (same_par)
 		return false;
 

status.23x

@@ -39,6 +39,8 @@ What's new
 
 - Insert new graphics inset on the correct cursor position.
 
+- Fix regression where spaces are disappearing when editing text (bug 11412).
+
 
 * DOCUMENTATION AND LOCALIZATION