Git commits in Moodle 3.6.5 by Bas Brands

commit acb53bb1f032b26b914d255a85d677caae13fe9e
Author: Bas Brands <bas@moodle.com>
Date:   Mon, 24 Jun 2019 20:27:14 +0800
Tag:    v3.6.5

MDL-64935 theme: prevent activitynavigation link overflowing container


commit 2dfa8e8d74220e6e78a14ef1789b06f3b0f29d93
Author: Bas Brands <bas@moodle.com>
Date:   Mon, 24 Jun 2019 18:10:48 +0800
Tag:    v3.6.5

MDL-66001 block_myoverview: fix incorrect closing tag


commit 97bfff5c12f233f74efafc4c1521eb3868366a37
Author: Bas Brands <bas@moodle.com>
Date:   Tue, 21 May 2019 23:07:31 +0800
Tag:    v3.6.5

MDL-61319 themes: prevent using @extend rules for complex classes


commit ed674e43c218b57c7d49a4007de55fb7f29dce1f
Author: Bas Brands <bas@moodle.com>
Date:   Tue, 14 May 2019 18:08:42 +0800
Tag:    v3.6.5

MDL-65596 core_message: dropdown menu blocked by contact request message


commit ca8cf5444e64b671d5c8154fccaec09f342ca74b
Author: Bas Brands <bas@moodle.com>
Date:   Mon, 13 May 2019 18:29:48 +0800
Tag:    v3.6.5

MDL-65581 core_blocks: change classname for hidden blocks