Skips replacement for fences inside list_blocks

Affects both markdown v1 and v2.
Skips template replacement for elements that are nested inside list_blocks,
which break parsing and compiling step.

Example:
1. List
   1. ```
      code
      ```

openformats/formats/github_markdown.py

@@ -215,7 +215,7 @@ def parse(self, content, **kwargs):
         curr_pos = 0
         for string in (yaml_stringset + block.md_stringset):
             string = string_handler(string, template)
-            if string:
+            if string and string in template[curr_pos:]:
                 string_object = OpenString(str(order), string, order=order)
                 order += 1
                 stringset.append(string_object)

openformats/formats/github_markdown_v2.py

@@ -117,7 +117,7 @@ def parse(self, content, **kwargs):
         curr_pos = 0
         for string in block.md_stringset:
             string = string_handler(string, md_template)
-            if string:
+            if string and string in template[curr_pos:]:
                 string_object = OpenString(str(order), string, order=order)
                 order += 1
                 stringset.append(string_object)

openformats/tests/formats/github_markdown/files/1_el.md

@@ -38,6 +38,9 @@ el:_You **can** combine bold and italic_
 * el:Item 2
   * el:Item 2a
   * el:Item 2b
+  * ```
+    Item 2c
+    ```
 
 ### el:Ordered
 
@@ -46,6 +49,9 @@ el:_You **can** combine bold and italic_
 1. el:Item 3
    1. el:Item 3a
    1. el:Item 3b
+   1. ```
+      Item 3c
+      ```
 
 
 ## el:Images

openformats/tests/formats/github_markdown/files/1_en.md

@@ -38,6 +38,9 @@ _You **can** combine bold and italic_
 * Item 2
   * Item 2a
   * Item 2b
+  * ```
+    Item 2c
+    ```
 
 ### Ordered
 
@@ -46,6 +49,9 @@ _You **can** combine bold and italic_
 1. Item 3
    1. Item 3a
    1. Item 3b
+   1. ```
+      Item 3c
+      ```
 
 
 ## Images

openformats/tests/formats/github_markdown/files/1_tpl.md

@@ -34,6 +34,9 @@ custom_vars:
 * 26101031d5115f57d3e8c34f2ac1f741_tr
   * ac435aa88d7932bc7c26dbe0277119a3_tr
   * 311a0516b1c6eb11a28e8deaa5c64c78_tr
+  * ```
+    Item 2c
+    ```
 
 ### a3575631fc76819748da773b5b0087a4_tr
 
@@ -42,6 +45,9 @@ custom_vars:
 1. 867da7e2af8e6b2f3aa7213a4080edb3_tr
    1. a6c1243676462dae35ed0c9122125d4e_tr
    1. 6994d1415b92982eb7cf57740b15b949_tr
+   1. ```
+      Item 3c
+      ```
 
 
 ## 061c16448aee6be07e20ab574ef27ea4_tr

openformats/tests/formats/github_markdown_v2/files/1_el.md

@@ -57,6 +57,9 @@ el:_You **can** combine bold and italic_
 * el:Item 2
   * el:Item 2a
   * el:Item 2b
+  * ```
+    Item 2c
+    ```
 
 ### el:Ordered
 
@@ -65,6 +68,9 @@ el:_You **can** combine bold and italic_
 1. el:Item 3
    1. el:Item 3a
    1. el:Item 3b
+   1. ```
+      Item 3c
+      ```
 
 
 ## el:Images

openformats/tests/formats/github_markdown_v2/files/1_en.md

@@ -60,6 +60,9 @@ _You **can** combine bold and italic_
 * Item 2
   * Item 2a
   * Item 2b
+  * ```
+    Item 2c
+    ```
 
 ### Ordered
 
@@ -68,6 +71,9 @@ _You **can** combine bold and italic_
 1. Item 3
    1. Item 3a
    1. Item 3b
+   1. ```
+      Item 3c
+      ```
 
 
 ## Images

openformats/tests/formats/github_markdown_v2/files/1_en_export.md

@@ -56,6 +56,9 @@ _You **can** combine bold and italic_
 * Item 2
   * Item 2a
   * Item 2b
+  * ```
+    Item 2c
+    ```
 
 ### Ordered
 
@@ -64,6 +67,9 @@ _You **can** combine bold and italic_
 1. Item 3
    1. Item 3a
    1. Item 3b
+   1. ```
+      Item 3c
+      ```
 
 
 ## Images

openformats/tests/formats/github_markdown_v2/files/1_tpl.md

@@ -51,6 +51,9 @@ a3575631fc76819748da773b5b0087a4_tr
 * 061c16448aee6be07e20ab574ef27ea4_tr
   * ea8a5a340cab600d88eea120273c4022_tr
   * 944024165d37855a16b48158a491e0a5_tr
+  * ```
+    Item 2c
+    ```
 
 ### d51c2a7526e97b2e9ba2d86ac075af7c_tr
 
@@ -59,6 +62,9 @@ a3575631fc76819748da773b5b0087a4_tr
 1. f1c3d12b026ece333653621093d9abe3_tr
    1. bb74ac206332955a7b4f5076f55b2e26_tr
    1. bc3bd100ff8a56464a05d8f7f8bb7a6d_tr
+   1. ```
+      Item 3c
+      ```
 
 
 ## 28e677da01f23106bbe6f32634edae27_tr