[BUGFIX] RTE Spellcheck dialogue opens with excessive height

By default, the RTE Spellcheck dialogue opens with excessive height
in Firefox.

Releases: master, 6.2
Resolves: #62113
Change-Id: Ifd92417ddc7c688bb752c4460a4992daf7173651
Reviewed-on: http://review.typo3.org/33216
Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>
[BUGFIX] RTE Spellcheck dialogue not correctly displayed

The RTE Spellcheck dialogue is not correctly displayed: the suggestions
and dictionaries fieldsets are never displayed in Firefox and Chrome
due to size constraints. In IE, the trigger elements of the combo boxes
are truncated on the right.

Releases: master, 6.2
Resolves: #62114
Change-Id: Iebff324164dc5975403e2217dd06def77e2eba6f
Reviewed-on: http://review.typo3.org/33218
Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>
[BUGFIX] RTE Spellcheck:default ISO code dictionary should be lowercase

When no default dictionary is configured for the ISO code of the
language of current content, the ISO code itself is taken as the name
of the Aspell dictionary. This should be lowercase.

Releases: master, 6.2
Resolves: #62128
Change-Id: I346469b0c1cd8a44227576b0d17cf231c205f961
Reviewed-on: http://review.typo3.org/33228
Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>
[BUGFIX] Possible race condition when creating directory

During various actions in the backend which require a cache directory
in typo3temp/ a race condition can occur while creating the directory.
The race condition is caused by GeneralUtility::createDirectoryPath.

There is a check whether the directory to be created already exists.
Later the directory is created using mkdir(). If in the meantime
another process creates the directory the exception will get thrown.

Resolves: #47269
Releases: master, 6.2
Change-Id: Iff46addd9ad6d738d1760f82a436dec9840c331d
Reviewed-on: http://review.typo3.org/32881
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>