Introduce environment-split before

This one prepends the new environment rather than appending it.

Easy way to add a new beamer frame before the current one.

src/LyXAction.cpp

@@ -1515,9 +1515,11 @@ void LyXAction::init()
  * \li Action: Splits the current environment with a Separator.
  * \li Syntax: environment-split [outer|previous]
  * \li Params: outer: If this is given, LyX will split the outermost environment in
- *                    the current nesting hierarchy.
+		      the current nesting hierarchy.
- *             previous: If this is given, LyX will split the environment in the previous
+	       previous: If this is given, LyX will split the environment in the previous
- *                    paragraph (is there is one).
+		      paragraph (is there is one).
+	       before: If this is given, the new environment will be appended rather than
+		      prepended.
  * \li Origin: spitz, 23 Dec 2012
  * \endvar
  */
@@ -3059,10 +3061,11 @@ void LyXAction::init()
  * \var lyx::FuncCode lyx::LFUN_PARAGRAPH_BREAK
  * \li Action: Breaks the current paragraph at the current location.
  * \li Notion: Removes the selection.
- * \li Syntax: paragraph-break [<LAYOUT>]
+ * \li Syntax: paragraph-break [<LAYOUT>] [ignoresep]
  * \li Params: <LAYOUT>: "inverse" - decreases depth by one (or change layout
                          to default layout) when the cursor is at the end of
                          the line.
+	       ignoresep: Do not account for paragraph separators while breaking.
  * \endvar
  */
 		{ LFUN_PARAGRAPH_BREAK, "paragraph-break", Noop, Edit },

src/Text3.cpp

@@ -1141,9 +1141,9 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
 			Font const f(inherit_font, cur.current_font.language());
 			pars_[cur.pit() - 1].resetFonts(f);
 		} else {
-			if (par.isEnvSeparator(cur.pos()))
+			if (par.isEnvSeparator(cur.pos()) && cmd.getArg(1) != "ignoresep")
 				cur.posForward();
-			breakParagraph(cur, cmd.argument() == "inverse");
+			breakParagraph(cur, cmd.getArg(0) == "inverse");
 		}
 		cur.resetAnchor();
 		// If we have a list and autoinsert item insets,
@@ -1493,6 +1493,7 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
 	case LFUN_ENVIRONMENT_SPLIT: {
 		bool const outer = cmd.argument() == "outer";
 		bool const previous = cmd.argument() == "previous";
+		bool const before = cmd.argument() == "before";
 		Paragraph const & para = cur.paragraph();
 		docstring layout;
 		if (para.layout().isEnvironment())
@@ -1521,7 +1522,9 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
 					break;
 			}
 		}
-		if (cur.pos() > 0)
+		if (before)
+			cur.top().setPitPos(cur.pit(), 0);
+		if (before || cur.pos() > 0)
 			lyx::dispatch(FuncRequest(LFUN_PARAGRAPH_BREAK));
 		if (outer) {
 			while (cur.paragraph().params().depth() > split_depth)
@@ -1530,7 +1533,14 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
 		DocumentClass const & tc = bv->buffer().params().documentClass();
 		lyx::dispatch(FuncRequest(LFUN_LAYOUT, tc.plainLayout().name()));
 		lyx::dispatch(FuncRequest(LFUN_SEPARATOR_INSERT, "plain"));
-		lyx::dispatch(FuncRequest(LFUN_PARAGRAPH_BREAK, "inverse"));
+		if (before) {
+			cur.backwardPos();
+			lyx::dispatch(FuncRequest(LFUN_PARAGRAPH_BREAK, "inverse ignoresep"));
+			while (cur.paragraph().params().depth() < split_depth)
+				lyx::dispatch(FuncRequest(LFUN_DEPTH_INCREMENT));
+		}
+		else
+			lyx::dispatch(FuncRequest(LFUN_PARAGRAPH_BREAK, "inverse"));
 		lyx::dispatch(FuncRequest(LFUN_LAYOUT, layout));
 
 		break;

src/frontends/qt4/Menus.cpp

@@ -1880,15 +1880,19 @@ void MenuDefinition::expandEnvironmentSeparators(BufferView const * bv)
 			break;
 	}
 	if (par.layout().isEnvironment()) {
-		docstring const label =
+		docstring label = bformat(_("Prepend New Environment (%1$s)"),
-			bformat(_("Start New Environment (%1$s)"),
+				translateIfPossible(curlayout));
+		add(MenuItem(MenuItem::Command, toqstr(label),
+			     FuncRequest(LFUN_ENVIRONMENT_SPLIT,
+					 from_ascii("before"))));
+		label = bformat(_("Append New Environment (%1$s)"),
 				translateIfPossible(curlayout));
 		add(MenuItem(MenuItem::Command, toqstr(label),
 			     FuncRequest(LFUN_ENVIRONMENT_SPLIT)));
 	}
 	else if (!prevlayout.empty()) {
 		docstring const label =
-			bformat(_("Start New Environment (%1$s)"),
+			bformat(_("Append New Environment (%1$s)"),
 				translateIfPossible(prevlayout));
 		add(MenuItem(MenuItem::Command, toqstr(label),
 			     FuncRequest(LFUN_ENVIRONMENT_SPLIT,
@@ -1896,7 +1900,7 @@ void MenuDefinition::expandEnvironmentSeparators(BufferView const * bv)
 	}
 	if (!outerlayout.empty()) {
 		docstring const label =
-			bformat(_("Start New Parent Environment (%1$s)"),
+			bformat(_("Append New Parent Environment (%1$s)"),
 				translateIfPossible(outerlayout));
 		add(MenuItem(MenuItem::Command, toqstr(label),
 			     FuncRequest(LFUN_ENVIRONMENT_SPLIT,