commit 17bf8fd74cc3324dd8ec95c0985a256ed7c316b8
Author: Jean-Marc Lasgouttes <[email protected]>
Date:   Tue Feb 20 12:09:10 2018 +0100

    Kill macro mode when using LFUN_ESCAPE
    
    Add a `cancel' boolean to macroModeClose() that just removes all trace
    of what has been entered instead of finalizing it.
    
    When entering a macro in mathed, let LFUN_ESCAPE invoke
    macroModeClose(true). The new semantics of LFUN_ESCAPE in mathed is
    thus to abort the input of a macro name.
    
    Fixes bug #9251.
    
    (cherry picked from commit 9296344b9a26191a2092d175a51e357ecc35145d)
---
 src/Cursor.cpp               |    4 ++--
 src/Cursor.h                 |    6 +++---
 src/mathed/InsetMathNest.cpp |    8 ++++++--
 status.23x                   |    3 +++
 4 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/Cursor.cpp b/src/Cursor.cpp
index 2e80605..984eb09 100644
--- a/src/Cursor.cpp
+++ b/src/Cursor.cpp
@@ -1413,7 +1413,7 @@ bool Cursor::down()
 }
 
 
-bool Cursor::macroModeClose()
+bool Cursor::macroModeClose(bool cancel)
 {
        if (!inMacroMode())
                return false;
@@ -1426,7 +1426,7 @@ bool Cursor::macroModeClose()
        cell().erase(pos());
 
        // do nothing if the macro name is empty
-       if (s == "\\")
+       if (s == "\\" || cancel)
                return false;
 
        // trigger updates of macros, at least, if no full
diff --git a/src/Cursor.h b/src/Cursor.h
index 8a8c719..1e66778 100644
--- a/src/Cursor.h
+++ b/src/Cursor.h
@@ -502,9 +502,9 @@ public:
        void setScreenPos(int x, int y);
        /// current offset in the top cell
 
-       /// interpret name a name of a macro. Returns true if
-       /// something got inserted.
-       bool macroModeClose();
+       /// interpret name of a macro or ditch it if \c cancel is true.
+       /// Returns true if something got inserted.
+       bool macroModeClose(bool cancel = false);
        /// are we currently typing the name of a macro?
        bool inMacroMode() const;
        /// get access to the macro we are currently typing
diff --git a/src/mathed/InsetMathNest.cpp b/src/mathed/InsetMathNest.cpp
index f9c8813..af50a7e 100644
--- a/src/mathed/InsetMathNest.cpp
+++ b/src/mathed/InsetMathNest.cpp
@@ -836,8 +836,12 @@ void InsetMathNest::doDispatch(Cursor & cur, FuncRequest & 
cmd)
                if (cur.selection())
                        cur.clearSelection();
                else  {
-                       cmd = FuncRequest(LFUN_FINISHED_FORWARD);
-                       cur.undispatched();
+                       if (cur.inMacroMode())
+                               cur.macroModeClose(true);
+                       else {
+                               cmd = FuncRequest(LFUN_FINISHED_FORWARD);
+                               cur.undispatched();
+                       }
                }
                break;
 
diff --git a/status.23x b/status.23x
index 74dc00f..42bc947 100644
--- a/status.23x
+++ b/status.23x
@@ -57,6 +57,9 @@ What's new
 
 - Fix ChkTeX on Windows (requires ChkTeX 1.7.7 at least) (bug 9989).
 
+- When entering a math macro name, Escape properly cancels the
+  operation (bug 9251).
+
 
 * INTERNALS
 

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