Handle min_length and max_length nil values (#17446).

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branch : 2.4-stable
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Merged r13340 from trunk to 2.4-stable (#17585)

fix typo in Traditional Chinese detailed syntax help.

Contributed by Felix Schäfer.

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branch : 2.4-stable
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Merged r13346 from trunk to 2.4-stable (#17581, #13932)

fix Drag & Drop does not work with Safari 5.1.

Contributed by fred bregar.

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branch : 2.4-stable
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Merged r13354 from trunk to 2.4-stable

add Ruby 1.9.2 to .travis.yml

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branch : 2.4-stable
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2.4-stable: pdf: fix failure exporting issue pdf with UTF-8 U+FFFD (#17826)

This revision has trunk r13368 and r13369 test.

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branch : 2.4-stable
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Merged r13404 from trunk to 2.4-stable (#17581)

stricter check of uploading attachments.

Contributed by fred bregar.

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branch : 2.4-stable
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Updates for 2.4.7 release.

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branch : 2.4-stable
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tagged version 2.4.7

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branch : 2.4-stable
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Merge with bb 2.4-stable branch

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branch : gh-bb-chili-mix-hg-git
Added tag bb-2.4.7 for changeset 9ea525398478

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branch : gh-bb-chili-mix-hg-git