[MDL-42684] Width of TinyMCE iframe narrower than bounding area - Moodle Tracker

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Testing Instructions:
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Each time, on a browser with cookies and cache completely cleared:
With Clean - for small screens, wide screens, and a few screen sizes in between:
With Standard - for decent sized screens (1024+) and wide screens:

load a page with Tiny MCE, fill it with content (also check multiple choice questions on quiz)

ensure the scrollbar appears in the right place

ensure the editor appears on the page correctly

ensure the editor takes up the same area as the filepicker below it

ensure you can still resize the editor smaller
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Each time, on a browser with cookies and cache completely cleared: With Clean - for small screens, wide screens, and a few screen sizes in between: With Standard - for decent sized screens (1024+) and wide screens: load a page with Tiny MCE, fill it with content (also check multiple choice questions on quiz) ensure the scrollbar appears in the right place ensure the editor appears on the page correctly ensure the editor takes up the same area as the filepicker below it ensure you can still resize the editor smaller
Affected Branches:
MOODLE_26_STABLE
Fixed Branches:
MOODLE_26_STABLE
Pull from Repository:
git://github.com/phalacee/moodle.git
Pull Master Branch:
~~MDL-42684~~-master
Pull Master Diff URL:
https://github.com/phalacee/moodle/compare/d214057...MDL-42684-master

It looks like the tinyMCE contenteditable iframe has suddenly lost some width since last week.

caused a regression

MDL-42854 Improving TinyMCE width

MDL-42887 Make the collapsing of form fields for bootstrap and non-bootstrap themes responsive.

Discovered while testing

MDL-42789 New TinyMCE does not fit in the question editing forms

is a regression caused by

MDL-42102 Style TinyMCE toolbars consistently with Moodle style

is blocked by

MDL-42660 Toolbars: the spacing is too large (standard and clean)

is duplicated by

MDL-42789 New TinyMCE does not fit in the question editing forms

will help resolve

MDL-42654 TinyMce: it's only displayed on half the screen

MDL-42656 TinyMce: on chrome, when the window is too small, the right side of the editor disappear behind the box container.

(1 is duplicated by, 2 will help resolve)