Display a different sign when there's a breakpoint on the PC line

Vim only renders a single sign-per-line. If we have the PC _and_ a
breakpoint, we should make that clear. Do this using a vimspectorPCBP
sign which combines both vimspectorPC and vimspectorBP (sort of).

We can't (unfortuantely) render the breakpoint blob in a different
colour, but it's at least obvious when we toggle on the PC line.

tests/breakpoints.test.vim

@@ -551,6 +551,7 @@ endfunction
 function! Test_Custom_Breakpoint_Priority()
   let g:vimspector_sign_priority = {
         \ 'vimspectorPC': 1,
+        \ 'vimspectorPCBP': 1,
         \ 'vimspectorBP': 2,
         \ 'vimspectorBPCond': 3,
         \ 'vimspectorBPDisabled': 4
@@ -597,7 +598,7 @@ function! Test_Custom_Breakpoint_Priority()
   call vimspector#test#signs#AssertSignAtLine(
         \ 'VimspectorCode',
         \ 15,
-        \ 'vimspectorPC',
+        \ 'vimspectorPCBP',
         \ 1 )
   call vimspector#test#signs#AssertSignGroupSingletonAtLine( 'VimspectorCode',
                                                            \ 17,
@@ -626,7 +627,7 @@ function! Test_Custom_Breakpoint_Priority()
   call vimspector#test#signs#AssertSignAtLine(
         \ 'VimspectorCode',
         \ 17,
-        \ 'vimspectorPC',
+        \ 'vimspectorPCBP',
         \ 1 )
 
 
@@ -684,7 +685,7 @@ function! Test_Custom_Breakpoint_Priority_Partial()
   call vimspector#test#signs#AssertSignAtLine(
         \ 'VimspectorCode',
         \ 15,
-        \ 'vimspectorPC',
+        \ 'vimspectorPCBP',
         \ 200 )
   call vimspector#test#signs#AssertSignGroupSingletonAtLine( 'VimspectorCode',
                                                            \ 17,
@@ -713,7 +714,7 @@ function! Test_Custom_Breakpoint_Priority_Partial()
   call vimspector#test#signs#AssertSignAtLine(
         \ 'VimspectorCode',
         \ 17,
-        \ 'vimspectorPC',
+        \ 'vimspectorPCBP',
         \ 200 )
 
 

tests/lib/autoload/vimspector/test/signs.vim

@@ -32,7 +32,7 @@ function! vimspector#test#signs#AssertPCIsAtLineInBuffer( buffer, line ) abort
   let index = 0
   while index < len( signs[ 0 ].signs )
     let s = signs[ 0 ].signs[ index ]
-    if s.name ==# 'vimspectorPC'
+    if s.name ==# 'vimspectorPC' || s.name ==# 'vimspectorPCBP'
       if assert_false( pc_index >= 0, 'Too many PC signs' )
         return 1
       endif