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This is a re-work of our completion engine. Primary goals are:

- Allow the computation to run in a separate thread so the GUI is not locked.
- Support a model-based approach. QStrings are still needed (filtering, etc), but
internal structures are free to use more efficient representations.
- Unifiy all kinds of *assist* into a more reusable and extensible framework.
- Remove unnecessary dependencies on the text editor so we have more generic
and easily "plugable" components (still things to be resolved).

Task-number: QTCREATORBUG-2847

this is where it belongs, rather than into some arbitrary editor.
as a nice side effect, now not only the "rename symbol", but also the
global search&replace has such a warning.

the info about the bars is now stored in the IFile, not in the
EditorView. this is somewhat more expensive for the bars which
identically apply to all editors of one type, but fixes consistency
issues between views.

additionally, it is now possible to set several simultaneous
info bars per file, which ensures that no information is lost.

Co-authored-by: mae

Change-Id: I8b73d583be1ee7183f4074bce49d5390e38631a2

add/unify read error handling in all affected classes

Cleaned up some hacky code in the process.

Done-with: Tobias Hunger

rename BastTextEditor->BaseTextEditorWidget, BaseTextEditorEditable->BaseTextEditor
rename BaseTextEditor{,Widget} subclasses
rename editableInterface->editorInterface
rename createEditableInterface->createEditor
minor cleanups after renamings

Done-by: Roberto Raggi
Reviewed-by: Leandro Melo
Reviewed-by: mae

Reviewed-by: hjk

Merge-request: 227
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

Reviewed-by: Christian Kamm

Provide an interface so users can create/edit/remove snippets.

Reviewed-by: Roberto Raggi

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: Thorbjorn Lindeijer

Reviewed-by: ckamm

Clean icore.h.

Remove internal markers from exported headers,
introduce private class for BaseTextDocument.
Reviewed-by: Leandro T. C. Melo <leandro.melo@nokia.com>

Task-number: QTCREATORBUG-2240
Reviewed-by: Erik Verbruggen

The debugger plugin opens an editor in this case, leading to fakevim and
cppeditor crashing.
This commit doesn't fix the problem's source, but adds safeguards that
are sensible anyhow: FakeVim should not register with editors during
shutdown, and CppEditor should not unconditionally assume an existing
editor manager in the destructor.

Reviewed-by: Friedemann Kleint

Reviewed-by: Christian Kamm

It is unnecessary to try hard to resolve a class forward declaration
when all you want to know is whether it is a valid link or not.

Task-number: QTCREATORBUG-2688
Reviewed-by: Thorbjorn Lindeijer

This should make the indenter less strict and annoying for non-standard
indentation styles.

Reviewed-by: Roberto Raggi

Thanks to this patch we can move the filtering of C++ symbols
in a background thread.

Done-with: Erik Verbruggen