'inccommand': Do not trigger during scripts, feedkeys().

src/nvim/ex_cmds_defs.h

@@ -124,7 +124,7 @@ struct exarg {
   LineGetter getline;           ///< Function used to get the next line
   void   *cookie;               ///< argument for getline()
   struct condstack *cstack;     ///< condition stack for ":if" etc.
-  bool is_live;                 ///< live preview
+  bool is_live;                 ///< 'inccommand' live preview
 };
 
 #define FORCE_BIN 1             // ":edit ++bin file"

src/nvim/ex_getln.c

@@ -1592,10 +1592,11 @@ static int command_line_changed(CommandLineState *s)
     redrawcmdline();
     s->did_incsearch = true;
   } else if (s->firstc == ':'
+             && KeyTyped            // only if interactive
              && *p_icm != NUL       // 'inccommand' is set
              && cmdline_star == 0   // not typing a password
              && cmd_is_live(ccline.cmdbuff)) {
-    // process a "live" command
+    // process a "live" command ('inccommand')
     do_cmdline(ccline.cmdbuff, NULL, NULL, DOCMD_KEEPLINE|DOCMD_LIVE);
     redrawcmdline();
   }

test/functional/ui/inccommand_spec.lua

@@ -58,8 +58,8 @@ describe(":substitute, inccommand=split does not trigger preview", function()
     common_setup(nil, "split", default_text)
   end)
 
-  it("when invoked by feedkeys() in a script ", function()
-    source(':call feedkeys(":%s/tw/MO/g\\<CR>")')
+  it("if invoked by a script ", function()
+    source('%s/tw/MO/g')
     wait()
     eq(1, eval("bufnr('$')"))
 
@@ -67,8 +67,12 @@ describe(":substitute, inccommand=split does not trigger preview", function()
     expect(default_text:gsub("tw", "MO"))
   end)
 
-  it("when invoked directly in a script ", function()
-    source('%s/tw/MO/g')
+  it("if invoked by feedkeys()", function()
+    -- in a script...
+    source([[:call feedkeys(":%s/tw/MO/g\<CR>")]])
+    wait()
+    -- or interactively...
+    feed([[:call feedkeys(":%s/tw/MO/g\<CR>")<CR>]])
     wait()
     eq(1, eval("bufnr('$')"))
 
@@ -1038,7 +1042,7 @@ describe("'inccommand' and :cnoremap", function()
       end
   end)
 
-  it('work with a failing mapping', function()
+  it('does not work with a failing mapping', function()
     for _, case in pairs(cases) do
       refresh(case)
       execute("cnoremap <expr> x execute('bwipeout!')[-1].'x'")
@@ -1047,14 +1051,7 @@ describe("'inccommand' and :cnoremap", function()
 
       -- error thrown b/c of the mapping
       neq(nil, eval('v:errmsg'):find('^E523:'))
-      -- the substitution after the error only works for ics=split/nosplit
-      -- which seems like the right thing to do in all cases, but we probably
-      -- don't want to change the default, so all in all this seems alright
-      if case == '' then
-        expect(default_text)
-      else
-        expect(default_text:gsub("tw", "tox"))
-      end
+      expect(default_text)
     end
   end)