Pass correct 'type' parameter to 'upgrader_process_complete' action in Theme_Upgrader.

props bamadesigner.
fixes #25882 for trunk.
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Split the content to balance open tags when `<!--nextpage-->` and `<!--more.*?-->` are used. Needs filter inline docs. The 4 unit tests that were previously failing for ticket 6297 now pass.

See #6297. 
Props devesine.


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Remove old debug comment. props nofearinc. fixes #25865.
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Don't convert URLs inside `<pre>` and `<code>` tags when parsing string using `make_clickable()`.
Adds Unit Tests.

Props johnjamesjacoby, helen, nacin, adamsilverstein, sirbrillig. 
Fixes #23756.


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Respect the `compare` operator value in `meta_query` when `value` evaluates to `null`. Adds Unit Test. 

Props bradyvercher, gradyetc.
Fixes #22967.


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Merge the Widgets Area Chooser feature plugin. First run, see #25821
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Produce proper `CAST` for `DECIMAL` and `NUMERIC` in Meta Query. Adds a bunch of unit tests.

Props ericlewis.
Fixes #23033.


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Twenty Fourteen: fix gallery layout issue in IE, props jartes and iamtakashi. Fixes #25625.
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