Patch: enable new view options similar to Diff (#5162)

* enable new view options on patch page

* add unit test

* new constant for unchanged lines

src/git/zcl_abapgit_git_add_patch.clas.abap

@@ -47,9 +47,9 @@ CLASS ZCL_ABAPGIT_GIT_ADD_PATCH IMPLEMENTATION.
     LOOP AT mt_diff ASSIGNING <ls_diff>.
 
       CASE <ls_diff>-result.
-        WHEN ' '.
+        WHEN zif_abapgit_definitions=>c_diff-unchanged.
 
-          INSERT <ls_diff>-new INTO TABLE rt_patch.
+          INSERT <ls_diff>-old INTO TABLE rt_patch.
 
         WHEN zif_abapgit_definitions=>c_diff-insert.
 

src/git/zcl_abapgit_git_add_patch.clas.testclasses.abap

@@ -23,6 +23,8 @@ CLASS ltcl_calculate_patch DEFINITION FINAL FOR TESTING
 
       mixed FOR TESTING RAISING cx_static_check,
 
+      no_diff FOR TESTING RAISING cx_static_check,
+
       unknown_result_type FOR TESTING RAISING cx_static_check.
 
     METHODS:
@@ -612,6 +614,23 @@ CLASS ltcl_calculate_patch IMPLEMENTATION.
 
   ENDMETHOD.
 
+
+  METHOD no_diff.
+
+    given_diff( iv_patch_flag = ' '
+                iv_new_num    = '    1'
+                iv_new        = '" new'
+                iv_result     = ' '
+                iv_old_num    = '    1'
+                iv_old        = '" old' ).
+
+    when_patch_is_calculated( ).
+
+    then_patch_should_be( |" old| ).
+
+  ENDMETHOD.
+
+
   METHOD unknown_result_type.
 
     given_diff( iv_patch_flag = ' '

src/ui/zcl_abapgit_gui_page_diff.clas.abap

@@ -152,9 +152,12 @@ CLASS zcl_abapgit_gui_page_diff DEFINITION
         VALUE(rv_is_refrseh) TYPE abap_bool.
     METHODS modify_files_before_diff_calc
       IMPORTING
-        !it_diff_files_old TYPE ty_file_diffs
+         it_diff_files_old TYPE ty_file_diffs
       RETURNING
         VALUE(rt_files)    TYPE zif_abapgit_definitions=>ty_stage_tt.
+    METHODS add_view_sub_menu
+      IMPORTING
+         io_menu TYPE REF TO zcl_abapgit_html_toolbar .
 
     METHODS render_content
         REDEFINITION .
@@ -232,9 +235,6 @@ CLASS zcl_abapgit_gui_page_diff DEFINITION
     METHODS add_filter_sub_menu
       IMPORTING
         !io_menu TYPE REF TO zcl_abapgit_html_toolbar .
-    METHODS add_view_sub_menu
-      IMPORTING
-        !io_menu TYPE REF TO zcl_abapgit_html_toolbar .
     METHODS render_lines
       IMPORTING
         !is_diff       TYPE ty_file_diff

src/ui/zcl_abapgit_gui_page_patch.clas.abap

@@ -164,6 +164,8 @@ CLASS zcl_abapgit_gui_page_patch IMPLEMENTATION.
                   iv_id  = 'stage'
                   iv_typ = zif_abapgit_html=>c_action_type-dummy ).
 
+    add_view_sub_menu( io_menu ).
+
   ENDMETHOD.
 
 

src/utils/zcl_abapgit_diff.clas.abap

@@ -150,7 +150,7 @@ CLASS zcl_abapgit_diff IMPLEMENTATION.
         ELSEIF <ls_delta>-flag1 = 'M' AND <ls_delta>-flag2 = 'M'.
           ls_diff-result = zif_abapgit_definitions=>c_diff-update.
         ELSEIF <ls_delta>-flag1 = '' AND <ls_delta>-flag2 = ''.
-          ls_diff-result = ''.
+          ls_diff-result = zif_abapgit_definitions=>c_diff-unchanged.
         ELSE.
           ASSERT 0 = 1. " unknown comparison result
         ENDIF.

src/zif_abapgit_definitions.intf.abap

@@ -392,6 +392,7 @@ INTERFACE zif_abapgit_definitions
     END OF c_git_branch.
   CONSTANTS:
     BEGIN OF c_diff,
+      unchanged TYPE c LENGTH 1 VALUE ' ',
       insert    TYPE c LENGTH 1 VALUE 'I',
       delete    TYPE c LENGTH 1 VALUE 'D',
       update    TYPE c LENGTH 1 VALUE 'U',