make it easy to copy text in the datatip

[clouds56]

Description

1. Hover on some variable and the datatip appears (ok)
2. Select text inside the datatip (ok only if the text is not collapsed)
3. Copy the text via shortcut Command+C (failed, sometimes nothing happens, while sometimes it copied nothing/empty)

For very long text in the datatip (collapsed with "...")
a. When not pinned, and "drag" in the datatip, it would recognize the "drag" as "click" and change the content in the datatip (collapse/uncollapse)
b. Pin the tooltip and then select text (failed, when drags in the tooltip, it moves the tooltip instead of selects

Expected Behavior

Copy texts in the datatips efficiently

Actual Behavior

Hard to copy and sometimes even select

Versions

• Atom: 1.24.0
• Client OS: macOS 10.13.3
• atom-ide-ui: 0.9.2

Additional Details

• Installed packages (apm ls --installed):

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