Change a on end of line behaviour to be consistent

`a` will just jump on next line, `a` on last end of line opens a new
line beneath it.

Fixes #1164

doc/pages/changelog.asciidoc

@@ -53,6 +53,10 @@ change to make Kakoune command model cleaner and more robust.
 
   See <<highlighters#,`:doc highlighters`>>
 
+* `a` on end of line is not treated specially anymore, it will start
+  inserting on the next character, which will be the first character
+  of the next line.
+
 == Kakoune 2018.04.13
 
 First official Kakoune release.

rc/core/c-family.kak

@@ -74,7 +74,7 @@ define-command -hidden c-family-indent-on-closing-curly-brace %[
 
 define-command -hidden c-family-insert-on-closing-curly-brace %[
     # add a semicolon after a closing brace if part of a class, union or struct definition
-    try %[ execute-keys -itersel -draft hm<a-x>B<a-x><a-k>\A\h*(class|struct|union|enum)<ret> a\;<esc> ]
+    try %[ execute-keys -itersel -draft hm<a-x>B<a-x><a-k>\A\h*(class|struct|union|enum)<ret> '<a-;>;i;<esc>' ]
 ]
 
 define-command -hidden c-family-insert-on-newline %[ evaluate-commands -itersel -draft %[

src/input_handler.cc

@@ -1117,7 +1117,7 @@ public:
             {
                 for (auto& sel : selections)
                 {
-                    if (sel.cursor() > sel.anchor() and sel.cursor().column > 0)
+                    if (sel.cursor() > sel.anchor() and sel.cursor() > BufferCoord{0, 0})
                         sel.cursor() = context().buffer().char_prev(sel.cursor());
                 }
             }
@@ -1362,11 +1362,9 @@ private:
         case InsertMode::Append:
             for (auto& sel : selections)
             {
-                sel.set(sel.min(), sel.max());
-                auto& cursor = sel.cursor();
-                // special case for end of lines, append to current line instead
-                if (cursor.column != buffer[cursor.line].length() - 1)
-                    cursor = buffer.char_next(cursor);
+                sel.set(sel.min(),  buffer.char_next(sel.max()));
+                if (sel.cursor() == buffer.end_coord())
+                    buffer.insert(buffer.end_coord(), "\n");
             }
             break;
         case InsertMode::AppendAtLineEnd:
@@ -1434,7 +1432,7 @@ private:
 
     ScopedEdition   m_edition;
     InsertCompleter m_completer;
-    bool            m_restore_cursor;
+    const bool      m_restore_cursor;
     bool            m_autoshowcompl;
     Timer           m_idle_timer;
     bool            m_in_end = false;

src/selection.cc

@@ -357,11 +357,7 @@ BufferCoord get_insert_pos(const Buffer& buffer, const Selection& sel,
     case InsertMode::InsertCursor:
         return sel.cursor();
     case InsertMode::Append:
-    {
-        // special case for end of lines, append to current line instead
-        auto pos = sel.max();
-        return buffer.byte_at(pos) == '\n' ? pos : buffer.char_next(pos);
-    }
+        return buffer.char_next(sel.max());
     case InsertMode::InsertAtLineBegin:
         return sel.min().line;
     case InsertMode::AppendAtLineEnd:

test/normal/repeat-insert/cmd

@@ -1 +1 @@
-afoo<esc>.
+ifoo<esc>.

test/normal/replay-macro/rc

@@ -1 +1 @@
-reg @ amawww
+reg @ imawww

test/regression/1680-crash-with-dot-and-alt-semicolon/out

@@ -1 +1,2 @@
+
 foofoo