GN: Trim newlines in markdown help blocks

GN: Trim newlines in markdown help blocks

In markdown mode (--markdown) GN puts the actual help text into fenced blocks.
Newlines at the beginning or end of such a block are not stripped and appear
in the generated HTML output, taking up vertical space.

This change ensures that newlines at the start and end are removed.

BUG=

Review-Url: https://codereview.chromium.org/2773043005
Cr-Commit-Position: refs/heads/master@{#460024}
Committed: https://chromium.googlesource.com/chromium/src/+/823f2a25b3be32ce6920072ec2b9c2d9f06ec377

[timn, 2017-03-25 17:53:58]

tim@rnc-ag.de changed reviewers:
+ brettw@chromium.org, dpranke@chromium.org

[timn, 2017-03-25 17:53:59]

Here's a screenshot illustrating the change:
https://drive.google.com/open?id=0B7IsT9R2REy-S19sMmpsSHFvX2s

The normal text output remains unchanged.

[brettw, 2017-03-27 16:55:51]

lgtm

[timn, 2017-03-28 04:55:56]

The CQ bit was checked by tim@rnc-ag.de to run a CQ dry run

[commit-bot: I haz the power, 2017-03-28 04:56:21]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-28 05:27:47]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-28 05:27:48]

Dry run: This issue passed the CQ dry run.

[timn, 2017-03-28 06:01:02]

The CQ bit was checked by tim@rnc-ag.de

[commit-bot: I haz the power, 2017-03-28 06:01:34]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-28 06:06:01]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490680862666390, "parent_rev":
"4e4edb9d083a96781c37b447cf47e4efd7ca8eb7", "commit_rev":
"823f2a25b3be32ce6920072ec2b9c2d9f06ec377"}

[commit-bot: I haz the power, 2017-03-28 06:07:19]

Description was changed from

==========
GN: Trim newlines in markdown help blocks

In markdown mode (--markdown) GN puts the actual help text into fenced blocks.
Newlines at the beginning or end of such a block are not stripped and appear
in the generated HTML output, taking up vertical space.

This change ensures that newlines at the start and end are removed.

BUG=
==========

to

==========
GN: Trim newlines in markdown help blocks

In markdown mode (--markdown) GN puts the actual help text into fenced blocks.
Newlines at the beginning or end of such a block are not stripped and appear
in the generated HTML output, taking up vertical space.

This change ensures that newlines at the start and end are removed.

BUG=

Review-Url: https://codereview.chromium.org/2773043005
Cr-Commit-Position: refs/heads/master@{#460024}
Committed:
https://chromium.googlesource.com/chromium/src/+/823f2a25b3be32ce6920072ec2b9...
==========

[commit-bot: I haz the power, 2017-03-28 06:07:21]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/823f2a25b3be32ce6920072ec2b9...

[Dirk Pranke, 2017-04-01 01:05:02]

lgtm also, thanks!