Revert "Set buffer when expanding macro"

This patch is not ready yet. Moreover, change the assertion in
InsetMathGrid::colAlign to a simple test.

As a consequence, math split inset might show a bad alignment in some
situations.

This reverts commit d3fd915662.

src/mathed/InsetMathGrid.cpp

@@ -1853,9 +1853,10 @@ char InsetMathGrid::colAlign(HullType type, col_type col) const
 	case hullMultline:
 		return 'c';
 	case hullGather:
-		LASSERT(isBufferValid(),
-				LYXERR0("Buffer not set correctly. Please report!");
-				return 'c';);
+		if (!isBufferValid()) {
+			LYXERR0("Buffer not set correctly. Please report!");
+			return 'c';
+		}
 		if (buffer().params().is_math_indent)
 			return 'l';
 		else

src/mathed/InsetMathMacro.cpp

@@ -669,9 +669,8 @@ void InsetMathMacro::updateRepresentation(Cursor * cur, MacroContext const & mc,
 	// than the one protected by UpdateLocker.
 	docstring const & display = d->macro_->display();
 	docstring const latexname = from_ascii("\\") + macroName();
-	bool const ret = d->macro_->expand(values, d->expanded_);
-	d->expanded_.setBuffer(buffer());
-	if (ret && !support::contains(display, latexname)) {
+	if (d->macro_->expand(values, d->expanded_)
+	    && !support::contains(display, latexname)) {
 		if (utype == OutputUpdate && !d->expanded_.empty())
 			d->expanded_.updateMacros(cur, mc, utype, nesting);
 	}

status.23x

@@ -153,11 +153,9 @@ What's new
 
 - Fix bad caret position when row scrolls horizontally (bug 11603).
 
-- Fix crash when inserting some macros (bug 11686).
+- Fix crash when inserting some insets in math split insets  (bug 11686).
 
-- Avoid future crashes with math split insets by adding an extra test.
-
-- Properly remember cursor posoiton when many files have been opened
+- Properly remember cursor position when many files have been opened
   (bug 10310).