It was being reset based on the highlighter definitions.

Consider some refactoring with the related options as well to avoid
overriding user's settings.

Done-with: Thorbjorn Lindeijer

Reviewed-by: ckamm

Example situation: The plain text editor is displaying in-memory content and
has not been explicitly "configured". If there's an attempt to indent the text
it crashes since the indenter is invalid. This can happen if one clicks on 'Show
View Contents in Editor' within a debug session and press enter in the editor.

Reviewed-by: con

Reviewed-by: con

Reviewed-by: con

Now the plain text editor only tries to apply a highlight configuration
if the MIME type passed is valid. Otherwise, it should behave as an ordinary
trivial editor and should not miss a highlight definition.

Now it is no longer necessary to close the editor for the highlighting to take effect.

A mostly mechanical change.

Reviewed-By: con

Relative to QTCREATORBUG-1225.

Generic highlighter: Interface for automatic download of available definitions. Refactorings and changes in related parts of the code.

Generic highlighter: New option to specify ignored file patterns so the highlight popup does not show up.

Now the highlighter engine does not directly depend on TextEditor::FontSettings. This also makes things easier for unit testing.

Generic highlighter: Mime type aliases and parents are now considered when searching for a definition.

Indenter is now a separate class which can be reused through composition. Added it to the generic editor.

They were no longer showing e.g. the file name of the diffed file.
Also separate editor id and editor context a bit.

  * Use id() for methods returning a string used to represent
    some type of object.
  * Use displayName() for strings that are meant to be user
    visible.
  * Quieten some warnings while touching the files anyway.
  * Move Factories to their products in the plugins where that
    was not done before.

Reviewed-by: dt

As it causes dashed lists to be formatted as
- i1
  - i2
Just do paragraph formatting.

Task-number: QTCREATORBUG-538
Initial-patch-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>
(cherry picked from commit 2986ccaf)

As it causes dashed lists to be formatted as
- i1
  - i2
Just do paragraph formatting.

Task-number: QTCREATORBUG-538
Initial-patch-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Reviewed-by: Trust Me

Conflicts:

	src/libs/cplusplus/CppBindings.cpp
	src/libs/cplusplus/CppBindings.h
	src/libs/cplusplus/FastPreprocessor.cpp
	src/libs/cplusplus/FastPreprocessor.h
	src/plugins/cpptools/cppcurrentdocumentfilter.cpp
	src/plugins/cpptools/cppcurrentdocumentfilter.h
	src/plugins/cpptools/cppsemanticsearch.cpp
	src/plugins/cpptools/cppsemanticsearch.h
	src/plugins/duieditor/parser/qmljs.g
	src/plugins/duieditor/parser/qmljsast.cpp
	src/plugins/duieditor/parser/qmljsast_p.h
	src/plugins/duieditor/parser/qmljsastfwd_p.h
	src/plugins/duieditor/parser/qmljsastvisitor.cpp
	src/plugins/duieditor/parser/qmljsastvisitor_p.h
	src/plugins/duieditor/parser/qmljsengine_p.cpp
	src/plugins/duieditor/parser/qmljsengine_p.h
	src/plugins/duieditor/parser/qmljsgrammar.cpp
	src/plugins/duieditor/parser/qmljsgrammar_p.h
	src/plugins/duieditor/parser/qmljslexer.cpp
	src/plugins/duieditor/parser/qmljslexer_p.h
	src/plugins/duieditor/parser/qmljsmemorypool_p.h
	src/plugins/duieditor/parser/qmljsnodepool_p.h
	src/plugins/duieditor/parser/qmljsparser.cpp
	src/plugins/duieditor/parser/qmljsparser_p.h
	src/plugins/duieditor/parser/qmljsprettypretty.cpp
	src/plugins/duieditor/parser/qmljsprettypretty_p.h
	src/plugins/duieditor/rewriter/rewriter.cpp
	src/plugins/duieditor/rewriter/rewriter_p.h
	src/plugins/duieditor/rewriter/textwriter.cpp
	src/plugins/duieditor/rewriter/textwriter_p.h
	src/shared/cplusplus/ASTClone.cpp
	tests/manual/cplusplus/main.cpp

Reviewed-by: Trust Me

    Task:     180315
    RevBy:
    Details:

Many singletons have their own instance() method, in which case there is
no need to use ICore::instance() to get access to them.