vim-patch:8.2.3013: Vim: when debugging only first line of command is displayed

Problem:    Vim: when debugging only the first line of a command using line
            continuation is displayed.
Solution:   Find the next command and concatenate lines until that one.
            (closes vim/vim#8392)

4cea536bdf

Co-authored-by: Bram Moolenaar <Bram@vim.org>

test/old/testdir/test_debugger.vim

@@ -992,6 +992,13 @@ func Test_debug_def_function()
       endfor
       echo "done"
     enddef
+
+    def g:FuncWithDict()
+      var d = {
+         a: 1,
+         b: 2,
+         }
+    enddef
   END
   call writefile(file, 'Xtest.vim')
 
@@ -1024,6 +1031,12 @@ func Test_debug_def_function()
   call RunDbgCmd(buf, 'step', ['line 3: echo it'])
   call RunDbgCmd(buf, 'step', ['3', 'function FuncWithArgs', 'line 4: endfor'])
   call RunDbgCmd(buf, 'step', ['line 5: echo "done"'])
+  call RunDbgCmd(buf, 'cont')
+
+  call RunDbgCmd(buf,
+                \ ':debug call FuncWithDict()',
+                \ ['cmd: call FuncWithDict()'])
+  call RunDbgCmd(buf, 'step', ['line 1: var d = {  a: 1,  b: 2,  }'])
 
   call RunDbgCmd(buf, 'cont')
   call StopVimInTerminal(buf)