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Avoid writing empty string prefixed arrays into settings, and some
isNull vs isEmpty confusion (xml reader seems to read null instead of
empty strings in some cases).

To achieve this there are two methods in IRunControlFactory you
need to implement:

1) createRunConfigurationAspect returns a IRunConfigurationAspect
which stores the settings specific to your plugin.
2) createConfigurationWidget returns a RunConfigWidget that will
be shown in the project settings

Merge-request: 258
Reviewed-by: hjk <qtc-committer@nokia.com>

Task-number: QTCREATORBUG-3842

Somehow got lost in merges 2.1 --> 2.2

Need /E:ON, V:ON for cmd.exe, do not pass empty environment
to QtcProcess.

Make sure parent pointers are cleared when removing nodes.

Do not crash when closing the options dialog for the second time.

Reviewed-by: thorbjorn

Continuing 561f87fc

In terms of buttons, layouts, aesthetics in general.

In QML, the current directory that holds a QML file is imported
implicitly. If it contains a qmldir file, the library is imported.

Since there is no explicit import statement, Creator can't know the URI
of this library. However, if type information is available for it
already - either through a previous dump or a qmltypes file - we can
guess the URI by looking at the contained exports.

Task-number: QTCREATORBUG-3768

For example when changing options in the git blame editor, the label
would resize since it took into account the block count, which is
temporarily 0 while the blame is calculated.

Done-with: Tobias Hunger

Cleaned up some hacky code in the process.

Done-with: Tobias Hunger

Merge-request: 256
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Do not retrieve debugger command from ABI as that causes mismatches
when several toolchains of the same ABI are present.
Use indexes in the debugger dialogs.
Polish tooltip.

Improves compatibility with TeamBuilder.

Reviewed-by: Tobias Hunger

Use in both engines preferred over ABI if it is compatible.
Report start parameters. Introduce gdb configuration check.

Reviewed-by: dt

The play button, that also allows changing animation speed, should never
be disabled since it works both in and outside of "observer" mode.

Reviewed-by: Kai Koehne

Avoids spelling problems, makes it easier to know all possible messages
and enables autocompletion.

The enum is part of a QObject derived class so that the meta object can
be used to print out the enumerators as readable strings.

Reviewed-by: Kai Koehne

- Make showWarningWithOptions actually show the details.
- Show errors from multiple engines as separate messages.
- Remove 'enabled' option from CDB (handled by toolchain config now).
- Show ABI as tooltip in debbugger toolchain chooser.

DebuggerLanguageChooser is in utils, which is why we cannot directly open
the URL in the help plugin.