Add integration tests to inline text formatting

[barklund]

Feature Description

Inline text formatting is in dire need of exhaustive integration testing, that can validate all the different possible interactions, including but not limited to:

In edit-mode: Inline collapsed selection

A.k.a. inline style override, works with bold, italic and underline only:

• works by shortcut, design panel or both (note limitation in Inline style override is not preserved when rich text editor focus is lost #1606)
• shows correct state in design panel

In edit-mode: Inline non-collapsed selection

To be checked with single style and multi style selection:

• check that design panel correctly reflects current selection
• check that boolean toggles (bold, italic and underline) work by shortcut and design panel
• check that selecting font weight, letter spacing or font color correctly styles selection
• check that non-inline properties still applies to entire text field even though inline selection exists

Not in edit-mode: Single text field selection

All to be checked with single style and multiple styles present:

• check that design panel correctly reflects state
• check that boolean toggles (bold, italic and underline) work by design panel (doesn't work by shortcut yet, to be done in Add Keyboard Shortcut on Element for Bold, Underline and Italics #1977)
• check that selecting font weight, letter spacing or font color correctly styles entire text field

Not in edit-mode: Multiple text field selection

All to be checked with single style and multiple styles present between text fields:

• check that design panel correctly reflects state
• check that boolean toggles (bold, italic and underline) work by design panel (doesn't work by shortcut yet, to be done in Add Keyboard Shortcut on Element for Bold, Underline and Italics #1977)
• check that selecting font weight, letter spacing or font color correctly styles all text fields

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Acceptance Criteria

QA Instructions