Bug 182560 – Web Inspector: Styles: text caret disappears after pressing arrow down for certain numeric values

• Status: NEW
• Component: Web Inspector

[Nikita Vasilyev]

Steps:
1. Add "border: 10px solid" CSS property.
2. Place text caret just before "10px".
3. Press Arrow Up key once.
4. Press Arrow Down key once.
5. Press Arrow Down key again.

Expected:
    border: 9px solid

Actual:
    border: 10px solid

Text caret disappears on the second press of arrow down key.

[Radar WebKit Bug Importer]

<rdar://problem/37298586>

[Nikita Vasilyev]

Removing these lines fixes the bug:

    // This check is for the situation when the cursor is in the space between the
    // opening quote of the attribute and the first character. In that spot, the
    // commonAncestorContainer is actually the entire attribute node since `="` is
    // added as a simple text node. Since the opening quote is immediately before
    // the attribute, the node for that attribute must be the next sibling and the
    // text of the attribute's value must be the first child of that sibling.
    if (container.parentNode.classList.contains("editing") && container.nextSibling) {
        container = container.nextSibling.firstChild;
        startOffset = 0;
    }

However, these lines were added in 2015 to fix Bug 149257 - Web Inspector: Option-Up doesn't increment certain attribute values.