Update MD009/no-trailing-spaces with code_blocks parameter to allow reporting/fixing trailing spaces in indented/fenced code blocks (fixes #1181).

doc/Rules.md

@@ -295,6 +295,7 @@ Aliases: `no-trailing-spaces`
 Parameters:
 
 - `br_spaces`: Spaces for line break (`integer`, default `2`)
+- `code_blocks`: Include code blocks (`boolean`, default `false`)
 - `list_item_empty_lines`: Allow spaces for empty lines in list items
   (`boolean`, default `false`)
 - `strict`: Include unnecessary breaks (`boolean`, default `false`)
@@ -304,21 +305,19 @@ Fixable: Some violations can be fixed by tooling
 This rule is triggered on any lines that end with unexpected whitespace. To fix
 this, remove the trailing space from the end of the line.
 
-Note: Trailing space is allowed in indented and fenced code blocks because some
-languages require it.
-
 The `br_spaces` parameter allows an exception to this rule for a specific number
 of trailing spaces, typically used to insert an explicit line break. The default
-value allows 2 spaces to indicate a hard break (\<br> element).
+value allows 2 spaces to indicate a hard break (\<br> element). (You must set
+`br_spaces` to a value >= 2 for this parameter to take effect. Setting
+`br_spaces` to 1 behaves the same as 0, disallowing any trailing spaces.)
 
-Note: You must set `br_spaces` to a value >= 2 for this parameter to take
-effect. Setting `br_spaces` to 1 behaves the same as 0, disallowing any trailing
-spaces.
+By default, trailing space is allowed in indented and fenced code blocks because
+some programming languages require that. To report such instances, set the
+`code_blocks` parameter to `true`.
 
 By default, this rule will not trigger when the allowed number of spaces is
 used, even when it doesn't create a hard break (for example, at the end of a
-paragraph). To report such instances as well, set the `strict` parameter to
-`true`.
+paragraph). To report such instances, set the `strict` parameter to `true`.
 
 ```markdown
 Text text text

doc/md009.md

@@ -7,6 +7,7 @@ Aliases: `no-trailing-spaces`
 Parameters:
 
 - `br_spaces`: Spaces for line break (`integer`, default `2`)
+- `code_blocks`: Include code blocks (`boolean`, default `false`)
 - `list_item_empty_lines`: Allow spaces for empty lines in list items
   (`boolean`, default `false`)
 - `strict`: Include unnecessary breaks (`boolean`, default `false`)
@@ -16,21 +17,19 @@ Fixable: Some violations can be fixed by tooling
 This rule is triggered on any lines that end with unexpected whitespace. To fix
 this, remove the trailing space from the end of the line.
 
-Note: Trailing space is allowed in indented and fenced code blocks because some
-languages require it.
-
 The `br_spaces` parameter allows an exception to this rule for a specific number
 of trailing spaces, typically used to insert an explicit line break. The default
-value allows 2 spaces to indicate a hard break (\<br> element).
+value allows 2 spaces to indicate a hard break (\<br> element). (You must set
+`br_spaces` to a value >= 2 for this parameter to take effect. Setting
+`br_spaces` to 1 behaves the same as 0, disallowing any trailing spaces.)
 
-Note: You must set `br_spaces` to a value >= 2 for this parameter to take
-effect. Setting `br_spaces` to 1 behaves the same as 0, disallowing any trailing
-spaces.
+By default, trailing space is allowed in indented and fenced code blocks because
+some programming languages require that. To report such instances, set the
+`code_blocks` parameter to `true`.
 
 By default, this rule will not trigger when the allowed number of spaces is
 used, even when it doesn't create a hard break (for example, at the end of a
-paragraph). To report such instances as well, set the `strict` parameter to
-`true`.
+paragraph). To report such instances, set the `strict` parameter to `true`.
 
 ```markdown
 Text text text